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Illustrated Checklist
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Native and Naturalized (1122)
Exotic: Provisional (31)
Exotic: Escapee (240)
Hybrids (313)
- Black-bellied x Fulvous Whistling-Duck (hybrid) Dendrocygna autumnalis x bicolorLast observed by Evan Farese on 26 Mar 2024
- Snow x Ross's Goose (hybrid) Anser caerulescens x rossiiLast observed by Steven Kurniawidjaja on 19 Apr 2024
- Emperor x Greater White-fronted Goose (hybrid) Anser canagicus x albifronsLast observed by Lucas stephenson on 18 Nov 2020
- Snow x Greater White-fronted Goose (hybrid) Anser caerulescens x albifronsLast observed by Tate Putman on 17 Mar 2024
- Ross's x Greater White-fronted Goose (hybrid) Anser rossii x albifronsLast observed by Steven Mlodinow on 18 Mar 2022
- Snow Goose x Brant (hybrid) Anser caerulescens x Branta berniclaLast observed by Rusty H on 26 Apr 2024
- Emperor x Cackling Goose (hybrid) Anser canagicus x Branta hutchinsiiLast observed by Gil Ewing on 11 Mar 2020
- Snow x Cackling Goose (hybrid) Anser caerulescens x Branta hutchinsiiLast observed by Craig Robson on 10 Apr 2024
- Ross's x Cackling Goose (hybrid) Anser rossii x Branta hutchinsiiLast observed by hv hughes on 27 Mar 2024
- Brant x Cackling Goose (hybrid) Branta bernicla x hutchinsiiLast observed by Jacob Drucker on 22 Mar 2014
- Greater White-fronted x Cackling Goose (hybrid) Anser albifrons x Branta hutchinsiiLast observed by Nolan Clements on 25 Apr 2024
- Barnacle x Cackling Goose (hybrid) Branta leucopsis x hutchinsiiLast observed by Tim Brown on 3 Feb 2024
- Swan Goose x Canada Goose (hybrid) Anser cygnoides x Branta canadensisLast observed by Holger Pflicke on 31 May 2024
- Greater White-fronted x Canada Goose (hybrid) Anser albifrons x Branta canadensisLast observed by Patrick O'Driscoll on 2 Jun 2024
- Greater White-fronted x Cackling/Canada Goose (hybrid) Anser albifrons x Branta hutchinsii/canadensisLast observed by Jonathan Irons on 29 Jan 2024
- Graylag x Canada Goose (hybrid) Anser anser x Branta canadensisLast observed by Jill Falasco on 3 Jun 2024
- Domestic goose sp. x Canada Goose (hybrid) Anser sp. (Domestic type) x Branta canadensisLast observed by Joseph Welklin on 3 Jun 2024
- Snow x Canada Goose (hybrid) Anser caerulescens x Branta canadensisLast observed by Luke Swiontek on 5 May 2024
- Ross's x Canada Goose (hybrid) Anser rossii x Branta canadensisLast observed by Scott Somershoe on 27 Feb 2024
- Barnacle x Canada Goose (hybrid) Branta leucopsis x canadensisLast observed by Tom Boyle on 9 Feb 2024
- Snow/Ross's x Cackling/Canada Goose (hybrid) Anser caerulescens/rossii x Branta hutchinsii/canadensisLast observed by Cole Wild on 13 Apr 2024
- Trumpeter x Tundra Swan (hybrid) Cygnus buccinator x columbianusLast observed by Adam Farid on 27 Feb 2023
- Trumpeter x Whooper Swan (hybrid) Cygnus buccinator x cygnusLast observed by Becky Schaffer on 29 May 2024
- Ruddy x Common Shelduck (hybrid) Tadorna ferruginea x tadornaLast observed by Jane Burmester on 19 Oct 2021
- Blue-winged x Cinnamon Teal (hybrid) Spatula discors x cyanopteraLast observed by Jethro Runco on 17 May 2024
- Blue-winged Teal x Northern Shoveler (hybrid) Spatula discors x clypeataLast observed by Laura Burke on 12 May 2024
- Cinnamon Teal x Northern Shoveler (hybrid) Spatula cyanoptera x clypeataLast observed by Henry Armknecht on 19 Apr 2024
- Northern Shoveler x Gadwall (hybrid) Spatula clypeata x Mareca streperaLast observed by Jay Breidt on 21 Apr 2024
- Blue-winged Teal x American Wigeon (hybrid) Spatula discors x Mareca americanaLast observed by Patricia Floyd on 18 May 2022
- Northern Shoveler x American Wigeon (hybrid) Spatula clypeata x Mareca americanaLast observed by Steve Colwell on 10 Jan 2022
- Gadwall x American Wigeon (hybrid) Mareca strepera x americanaLast observed by Cameron Cox on 8 Jan 2024
- Eurasian x American Wigeon (hybrid) Mareca penelope x americanaLast observed by Steve Heinl on 28 May 2024
- Muscovy Duck x Mallard (hybrid) Cairina moschata x Anas platyrhynchosLast observed by Laurie Witkin on 3 Jun 2024
- Wood Duck x Mallard (hybrid) Aix sponsa x Anas platyrhynchosLast observed by Lorin Wilkerson on 30 Apr 2024
- Northern Shoveler x Mallard (hybrid) Spatula clypeata x Anas platyrhynchosLast observed by Lauren Whitenack on 6 Apr 2024
- Gadwall x Mallard (hybrid) Mareca strepera x Anas platyrhynchosLast observed by D McClure on 5 May 2024
- American Wigeon x Mallard (hybrid) Mareca americana x Anas platyrhynchosLast observed by Daxton Bryce on 7 May 2024
- Mallard x Pacific Black Duck (hybrid) Anas platyrhynchos x superciliosaLast observed by Eddie Politz on 14 Oct 2023
- Mallard x Hawaiian Duck (hybrid) Anas platyrhynchos x wyvillianaLast observed by Pearse Narum on 3 Jun 2024
- Mallard x Eastern Spot-billed Duck (hybrid) Anas platyrhynchos x zonorhynchaLast observed by Lorri Lilja on 12 Feb 2021
- Mallard x Mexican Duck (hybrid) Anas platyrhynchos x diaziLast observed by Charles Hathcock on 3 Jun 2024
- American Wigeon x American Black Duck (hybrid) Mareca americana x Anas rubripesLast observed by reilly mccue on 23 Feb 2019
- Mallard x American Black Duck (hybrid) Anas platyrhynchos x rubripesLast observed by Andrew Thornton on 3 Jun 2024
- Mallard x Mottled Duck (hybrid) Anas platyrhynchos x fulvigulaLast observed by William Hoeck on 4 Jun 2024
- Mallard x Mexican/Mottled Duck (hybrid) Anas platyrhynchos x diazi/fulvigulaLast observed by Spencer Santi on 12 Apr 2024
- Gadwall x Northern Pintail (hybrid) Mareca strepera x Anas acutaLast observed by Stephen Heinrich on 1 May 2024
- Eurasian Wigeon x Northern Pintail (hybrid) Mareca penelope x Anas acutaLast observed by Ed Corey on 5 Dec 2020
- American Wigeon x Northern Pintail (hybrid) Mareca americana x Anas acutaLast observed by Shep Thorp on 27 Mar 2024
- Mallard x Northern Pintail (hybrid) Anas platyrhynchos x acutaLast observed by michelle d on 26 May 2024
- Blue-winged x Green-winged Teal (hybrid) Spatula discors x Anas creccaLast observed by Jayson Giese on 4 May 2024
- Cinnamon x Green-winged Teal (hybrid) Spatula cyanoptera x Anas creccaLast observed by Amy Phillips on 28 May 2024
- Gadwall x Green-winged Teal (hybrid) Mareca strepera x Anas creccaLast observed by Bob Greenleaf on 20 Feb 2022
- American Wigeon x Green-winged Teal (hybrid) Mareca americana x Anas creccaLast observed by Jeff Hoppes on 17 Mar 2024
- Mallard x Green-winged Teal (hybrid) Anas platyrhynchos x creccaLast observed by Nicholas Niewald on 27 Jan 2024
- Northern Pintail x Green-winged Teal (hybrid) Anas acuta x creccaLast observed by Monica Fletcher on 28 Apr 2024
- Mallard x Redhead (hybrid) Anas platyrhynchos x Aythya americanaLast observed by Greg Ward on 18 Dec 2016
- Canvasback x Redhead (hybrid) Aythya valisineria x americanaLast observed by Don Henise on 15 Mar 2024
- Mallard x Ring-necked Duck (hybrid) Anas platyrhynchos x Aythya collarisLast observed by Phyllis Mansfield on 1 Jan 2023
- Canvasback x Ring-necked Duck (hybrid) Aythya valisineria x collarisLast observed by Jeff Bleam on 20 Feb 2024
- Redhead x Ring-necked Duck (hybrid) Aythya americana x collarisLast observed by Justin Labadie on 18 May 2024
- Ring-necked x Tufted Duck (hybrid) Aythya collaris x fuligulaLast observed by Peder Svingen on 13 Dec 2018
- Redhead x Greater Scaup (hybrid) Aythya americana x marilaLast observed by Steven Mlodinow on 4 Apr 2021
- Ring-necked Duck x Greater Scaup (hybrid) Aythya collaris x marilaLast observed by Sean Williams on 21 Mar 2024
- Tufted Duck x Greater Scaup (hybrid) Aythya fuligula x marilaLast observed by Sean Williams on 21 Mar 2024
- Ring-necked Duck x Lesser Scaup (hybrid) Aythya collaris x affinisLast observed by Steven Mlodinow on 22 Mar 2024
- Tufted Duck x Lesser Scaup (hybrid) Aythya fuligula x affinisLast observed by Anonymous eBirber on 27 May 2024
- Canvasback x scaup sp. (hybrid) Aythya valisineria x marila/affinisLast observed by Jay McGowan on 27 Jan 2021
- Redhead x scaup sp. (hybrid) Aythya americana x marila/affinisLast observed by Livia Santana on 17 Feb 2024
- Ring-necked Duck x scaup sp. (hybrid) Aythya collaris x marila/affinisLast observed by David Robichaud on 24 Apr 2024
- Tufted Duck x scaup sp. (hybrid) Aythya fuligula x marila/affinisLast observed by Braden Ribbens on 27 May 2024
- Spectacled x King Eider (hybrid) Somateria fischeri x spectabilisLast observed by Caroline Lambert on 22 Jun 2018
- King x Common Eider (hybrid) Somateria spectabilis x mollissimaLast observed by andrew aldrich on 28 Jan 2020
- Surf x White-winged Scoter (hybrid) Melanitta perspicillata x deglandiLast observed by Luke Seitz on 23 Oct 2016
- Bufflehead x Common Goldeneye (hybrid) Bucephala albeola x clangulaLast observed by Craig R Miller on 6 Apr 2024
- Bufflehead x goldeneye sp. (hybrid) Bucephala albeola x clangula/islandicaLast observed by Timo Mitzen on 14 Apr 2024
- Common x Barrow's Goldeneye (hybrid) Bucephala clangula x islandicaLast observed by Laura Burke on 5 Apr 2024
- Wood Duck x Hooded Merganser (hybrid) Aix sponsa x Lophodytes cucullatusLast observed by Kyle Lindemer on 11 Oct 2013
- Bufflehead x Hooded Merganser (hybrid) Bucephala albeola x Lophodytes cucullatusLast observed by Rosemary Seidler on 29 Dec 2023
- Common Goldeneye x Hooded Merganser (hybrid) Bucephala clangula x Lophodytes cucullatusLast observed by Jayson Giese on 1 Mar 2024
- Barrow's Goldeneye x Hooded Merganser (hybrid) Bucephala islandica x Lophodytes cucullatusLast observed by Rachel Hudson on 2 Mar 2023
- goldeneye sp. x Hooded Merganser (hybrid) Bucephala clangula/islandica x Lophodytes cucullatusLast observed by Daniel Stoken on 14 Jan 2024
- Hooded x Common Merganser (hybrid) Lophodytes cucullatus x Mergus merganserLast observed by Ryan Votta on 13 Feb 2024
- Northern Bobwhite x Scaled Quail (hybrid) Colinus virginianus x Callipepla squamataLast observed by Jim Crites on 14 Aug 2018
- Northern Bobwhite x California Quail (hybrid) Colinus virginianus x Callipepla californicaLast observed by Jeff Huth on 4 Aug 2021
- Scaled x Gambel's Quail (hybrid) Callipepla squamata x gambeliiLast observed by Mariel Campbell on 20 Apr 2024
- California x Gambel's Quail (hybrid) Callipepla californica x gambeliiLast observed by Paulette Ache on 24 May 2024
- Greater Sage-Grouse x Sharp-tailed Grouse (hybrid) Centrocercus urophasianus x Tympanuchus phasianellusLast observed by Noah Kück on 3 Apr 2021
- Dusky x Sharp-tailed Grouse (hybrid) Dendragapus obscurus x Tympanuchus phasianellusLast observed by Ryan O'Donnell on 7 Apr 2013
- Sharp-tailed Grouse x Greater Prairie-Chicken (hybrid) Tympanuchus phasianellus x cupidoLast observed by Tom Gilde on 1 May 2024
- Greater x Lesser Prairie-Chicken (hybrid) Tympanuchus cupido x pallidicinctusLast observed by Kate Northrop on 5 May 2024
- Golden x Lady Amherst's Pheasant (hybrid) Chrysolophus pictus x amherstiaeLast observed by Asher Perla on 29 Oct 2022
- Western x Clark's Grebe (hybrid) Aechmophorus occidentalis x clarkiiLast observed by Steven Mlodinow on 2 Jun 2024
- Eurasian x African Collared-Dove (hybrid) Streptopelia decaocto x roseogriseaLast observed by Lonny Garris on 25 Nov 2023
- Eurasian Collared-Dove x Mourning Dove (hybrid) Streptopelia decaocto x Zenaida macrouraLast observed by Crystal Leslie on 10 Dec 2023
- Lucifer x Black-chinned Hummingbird (hybrid) Calothorax lucifer x Archilochus alexandriLast observed by Marty Herde on 2 Jun 2024
- Ruby-throated x Black-chinned Hummingbird (hybrid) Archilochus colubris x alexandriLast observed by Don Pearson on 21 May 2024
- Lucifer x Anna's Hummingbird (hybrid) Calothorax lucifer x Calypte annaLast observed by Rick Taylor on 4 Aug 2010
- Black-chinned x Anna's Hummingbird (hybrid) Archilochus alexandri x Calypte annaLast observed by Andrew Lee on 22 Aug 2023
- Lucifer x Costa's Hummingbird (hybrid) Calothorax lucifer x Calypte costaeLast observed by Cathy Beck on 16 Jun 2022
- Black-chinned x Costa's Hummingbird (hybrid) Archilochus alexandri x Calypte costaeLast observed by Felipe Guerrero on 19 Nov 2022
- Anna's x Costa's Hummingbird (hybrid) Calypte anna x costaeLast observed by Tyler McClure on 21 May 2024
- Black-chinned x Calliope Hummingbird (hybrid) Archilochus alexandri x Selasphorus calliopeLast observed by Carol Comeau on 14 Aug 2023
- Anna's x Calliope Hummingbird (hybrid) Calypte anna x Selasphorus calliopeLast observed by Laura Keene on 16 Feb 2024
- Black-chinned x Rufous Hummingbird (hybrid) Archilochus alexandri x Selasphorus rufusLast observed by Nancy Clogston on 30 Apr 2021
- Anna's x Rufous Hummingbird (hybrid) Calypte anna x Selasphorus rufusLast observed by Jacklyn Canterbury on 10 Apr 2024
- Calliope x Rufous Hummingbird (hybrid) Selasphorus calliope x rufusLast observed by Anita Strawn de Ojeda on 19 Aug 2023
- Anna's x Allen's Hummingbird (hybrid) Calypte anna x Selasphorus sasinLast observed by Tricia Thrasher on 18 Oct 2023
- Rufous x Allen's Hummingbird (hybrid) Selasphorus rufus x sasinLast observed by karen saxton on 2 Jun 2024
- Ruby-throated x Broad-tailed Hummingbird (hybrid) Archilochus colubris x Selasphorus platycercusLast observed by Juanita Whittecar on 9 Jul 2014
- Black-chinned x Broad-tailed Hummingbird (hybrid) Archilochus alexandri x Selasphorus platycercusLast observed by Wendy McCrady on 26 Aug 2023
- Calliope x Broad-tailed Hummingbird (hybrid) Selasphorus calliope x platycercusLast observed by Bryant Olsen on 17 Jun 2016
- Rufous x Broad-tailed Hummingbird (hybrid) Selasphorus rufus x platycercusLast observed by Scott Heppel on 19 Jun 2020
- Anna's Hummingbird x Selasphorus sp. (hybrid) Calypte anna x Selasphorus sp.Last observed by Kiandra Mitchell on 4 May 2024
- Black-chinned x Broad-billed Hummingbird (hybrid) Archilochus alexandri x Cynanthus latirostrisLast observed by Asher Perla on 15 Jul 2023
- Anna's x Broad-billed Hummingbird (hybrid) Calypte anna x Cynanthus latirostrisLast observed by Rose Ann Rowlett on 19 Mar 2024
- Costa's x Broad-billed Hummingbird (hybrid) Calypte costae x Cynanthus latirostrisLast observed by Konshau Duman on 13 Aug 2020
- Rivoli's x White-eared Hummingbird (hybrid) Eugenes fulgens x Hylocharis leucotisLast observed by Steven Cardiff on 29 Apr 2009
- Broad-billed x Violet-crowned Hummingbird (hybrid) Cynanthus latirostris x Ramosomyia violicepsLast observed by Nate Peterson on 13 Sep 2023
- Rivoli's x Berylline Hummingbird (hybrid) Eugenes fulgens x Saucerottia beryllinaLast observed by Kenny Younger on 4 Dec 2021
- King x Clapper Rail (hybrid) Rallus elegans x crepitansLast observed by Anthony Macchiarola on 18 May 2024
- Common Gallinule x American Coot (hybrid) Gallinula galeata x Fulica americanaLast observed by julia hartlage on 9 Nov 2021
- Sandhill x Common Crane (hybrid) Antigone canadensis x Grus grusLast observed by Martin Dellwo on 2 Jan 2022
- Sandhill x Whooping Crane (hybrid) Antigone canadensis x Grus americanaLast observed by Melody Walsh on 24 Jun 2015
- American x Black Oystercatcher (hybrid) Haematopus palliatus x bachmaniLast observed by Steven Lima on 28 May 2024
- Great Knot x Surfbird (hybrid) Calidris tenuirostris x virgataLast observed by Matthew Grube on 14 Jul 2012
- Buff-breasted x White-rumped Sandpiper (hybrid) Calidris subruficollis x fuscicollisLast observed by Anne Ruben on 23 Jun 2022
- Dunlin x White-rumped Sandpiper (hybrid) Calidris alpina x fuscicollisLast observed by Severin Uebbing on 12 Jun 2022
- Curlew x Pectoral Sandpiper (hybrid) Calidris ferruginea x melanotosLast observed by Soheil Zendeh on 21 Sep 1987
- Thick-billed x Common Murre (hybrid) Uria lomvia x aalgeLast observed by Ryan O'Donnell on 1 Jun 2012
- Black-headed x Ring-billed Gull (hybrid) Chroicocephalus ridibundus x Larus delawarensisLast observed by MI YU on 12 Jan 2024
- Laughing x Ring-billed Gull (hybrid) Leucophaeus atricilla x Larus delawarensisLast observed by Jake Vinsel on 23 May 2024
- Kelp x Herring Gull (hybrid) Larus dominicanus x argentatusLast observed by Connor Gable on 23 Apr 2024
- Herring x Great Black-backed Gull (hybrid) Larus argentatus x marinusLast observed by John Pogacnik on 16 Mar 2024
- Herring x Glaucous Gull (hybrid) Larus argentatus x hyperboreusLast observed by Bill Shelmerdine on 17 Apr 2024
- Great Black-backed x Glaucous Gull (hybrid) Larus marinus x hyperboreusLast observed by Larry Chen on 25 Nov 2021
- Herring x Lesser Black-backed Gull (hybrid) Larus argentatus x fuscusLast observed by Daniel Irons on 7 Apr 2024
- Herring x California Gull (hybrid) Larus argentatus x californicusLast observed by Anonymous eBirber on 26 Jul 2023
- Western x Glaucous-winged Gull (hybrid) Larus occidentalis x glaucescensLast observed by Alexander Sowers on 3 Jun 2024
- Herring x Glaucous-winged Gull (hybrid) Larus argentatus x glaucescensLast observed by John Pearce on 3 Jun 2024
- Glaucous x Glaucous-winged Gull (hybrid) Larus hyperboreus x glaucescensLast observed by Cal Gesmundo on 24 May 2024
- Herring x Slaty-backed Gull (hybrid) Larus argentatus x schistisagusLast observed by Colette Micallef on 1 Oct 2023
- Glaucous-winged x Slaty-backed Gull (hybrid) Larus glaucescens x schistisagusLast observed by Sulli Gibson on 14 May 2024
- Glaucous x Slaty-backed Gull (hybrid) Larus hyperboreus x schistisagusLast observed by Daniel Nelson on 19 Jun 2021
- Herring x Iceland Gull (hybrid) Larus argentatus x glaucoidesLast observed by CBC Historic Data on 17 Feb 2001
- Common x Roseate Tern (hybrid) Sterna hirundo x dougalliiLast observed by Bird Observer Data on 8 Jun 2008
- Sandwich x Elegant Tern (hybrid) Thalasseus sandvicensis x elegansLast observed by Nathan French on 19 Aug 2023
- Laysan x Black-footed Albatross (hybrid) Phoebastria immutabilis x nigripesLast observed by Sarah Donahue on 15 Mar 2024
- Brown x Blue-footed Booby (hybrid) Sula leucogaster x nebouxiiLast observed by Jonathan Feenstra on 6 Sep 2022
- Double-crested x Neotropic Cormorant (hybrid) Nannopterum auritum x brasilianumLast observed by Mark W. Lockwood on 5 Nov 2023
- Yellow-crowned x Black-crowned Night Heron (hybrid) Nyctanassa violacea x Nycticorax nycticoraxLast observed by Jon Fisher on 19 May 2021
- Little Blue x Tricolored Heron (hybrid) Egretta caerulea x tricolorLast observed by Ryan Salsman on 27 Feb 2022
- Little Blue Heron x Snowy Egret (hybrid) Egretta caerulea x thulaLast observed by ♏️ ©️ on 11 May 2024
- Tricolored Heron x Snowy Egret (hybrid) Egretta tricolor x thulaLast observed by Peg Glynn on 29 Mar 2024
- Snowy x Little Egret (hybrid) Egretta thula x garzettaLast observed by Sheryl Johnson on 10 May 2024
- Great Egret x Great Blue Heron (hybrid) Ardea alba x herodiasLast observed by David Simpson on 6 Jul 2023
- Glossy x White-faced Ibis (hybrid) Plegadis falcinellus x chihiLast observed by Cole Wild on 25 May 2024
- Common Black x Red-shouldered Hawk (hybrid) Buteogallus anthracinus x Buteo lineatusLast observed by Clayton Rucker on 1 Jun 2024
- Red-shouldered x Broad-winged Hawk (hybrid) Buteo lineatus x platypterusLast observed by Lynn Gregg on 16 Nov 2020
- Red-shouldered x Red-tailed Hawk (hybrid) Buteo lineatus x jamaicensisLast observed by Ryan Schain on 6 May 2024
- Swainson's x Rough-legged Hawk (hybrid) Buteo swainsoni x lagopusLast observed by Martin Reid on 19 Nov 2002
- Red-tailed x Rough-legged Hawk (hybrid) Buteo jamaicensis x lagopusLast observed by Barb Rimel on 10 Mar 2024
- Red-tailed x Ferruginous Hawk (hybrid) Buteo jamaicensis x regalisLast observed by Ted Floyd on 14 Mar 2024
- Western x Eastern Screech-Owl (hybrid) Megascops kennicottii x asioLast observed by Steven Mlodinow on 13 Jan 2018
- Spotted x Barred Owl (hybrid) Strix occidentalis x variaLast observed by Charlie Wright on 29 May 2023
- Yellow-bellied x Red-naped Sapsucker (hybrid) Sphyrapicus varius x nuchalisLast observed by Rose Ann Rowlett on 18 May 2024
- Yellow-bellied x Red-breasted Sapsucker (hybrid) Sphyrapicus varius x ruberLast observed by Zak Pohlen on 26 Jul 2023
- Red-naped x Red-breasted Sapsucker (hybrid) Sphyrapicus nuchalis x ruberLast observed by Tera Freedman on 2 Jun 2024
- Yellow-bellied/Red-naped x Red-breasted Sapsucker (hybrid) Sphyrapicus varius/nuchalis x ruberLast observed by Garrett Haring on 22 Mar 2024
- Golden-fronted x Red-bellied Woodpecker (hybrid) Melanerpes aurifrons x carolinusLast observed by Elliott Ress on 15 May 2024
- Downy x Nuttall's Woodpecker (hybrid) Dryobates pubescens x nuttalliiLast observed by Bridget Spencer on 29 May 2024
- Downy x Ladder-backed Woodpecker (hybrid) Dryobates pubescens x scalarisLast observed by Steven Mlodinow on 8 May 2024
- Nuttall's x Ladder-backed Woodpecker (hybrid) Dryobates nuttallii x scalarisLast observed by Matthew Grube on 1 Jun 2024
- Downy x Hairy Woodpecker (hybrid) Dryobates pubescens x villosusLast observed by Cristina Hartshorn on 27 Apr 2024
- Nuttall's x Hairy Woodpecker (hybrid) Dryobates nuttallii x villosusLast observed by Mark Chichester on 5 Jun 1993
- Ladder-backed x Hairy Woodpecker (hybrid) Dryobates scalaris x villosusLast observed by Naresh Satyan on 9 Apr 2023
- Hairy x White-headed Woodpecker (hybrid) Dryobates villosus x albolarvatusLast observed by William Rockey on 23 Nov 2022
- Northern x Gilded Flicker (hybrid) Colaptes auratus x chrysoidesLast observed by Cathy Beck on 27 Dec 2023
- Peregrine x Prairie Falcon (hybrid) Falco peregrinus x mexicanusLast observed by Tim Liguori on 21 Mar 2017
- White x Salmon-crested Cockatoo (hybrid) Cacatua alba x moluccensisLast observed by Gary/Rebecca Granger/Provorse on 31 May 2024
- Crimson x Eastern Rosella (hybrid) Platycercus elegans x eximiusLast observed by Robert Gundy on 18 Jul 2020
- Fischer's x Yellow-collared Lovebird (hybrid) Agapornis fischeri x personatusLast observed by Joshua Mitchell on 9 Jan 2024
- White-winged x Yellow-chevroned Parakeet (hybrid) Brotogeris versicolurus x chiririLast observed by Russell Titus on 6 Apr 2016
- Red-crowned x Lilac-crowned Parrot (hybrid) Amazona viridigenalis x finschiLast observed by James Hanley on 2 Jun 2024
- Red-crowned x Red-lored Parrot (hybrid) Amazona viridigenalis x autumnalisLast observed by Liam Huber on 18 Apr 2024
- Blue-and-yellow x Scarlet Macaw (hybrid) Ara ararauna x macaoLast observed by carolyn spidle on 21 Jan 2022
- Western x Eastern Wood-Pewee (hybrid) Contopus sordidulus x virensLast observed by Cole Sage on 25 Jul 2020
- Black x Eastern Phoebe (hybrid) Sayornis nigricans x phoebeLast observed by Debra Bogar on 1 Jun 2024
- Couch's x Western Kingbird (hybrid) Tyrannus couchii x verticalisLast observed by Jon Cefus on 26 Dec 2015
- Western x Eastern Kingbird (hybrid) Tyrannus verticalis x tyrannusLast observed by gene collins on 7 Jun 2023
- Tropical x Gray Kingbird (hybrid) Tyrannus melancholicus x dominicensisLast observed by Ernesto Reyes on 14 Sep 2022
- Couch's Kingbird x Scissor-tailed Flycatcher (hybrid) Tyrannus couchii x forficatusLast observed by Greg Whittaker on 2 Nov 2022
- Western Kingbird x Scissor-tailed Flycatcher (hybrid) Tyrannus verticalis x forficatusLast observed by Daniel Denman on 17 Apr 2024
- Black-capped x White-eyed Vireo (hybrid) Vireo atricapilla x griseusLast observed by Laurie Lawler on 10 May 2023
- Yellow-throated x Blue-headed Vireo (hybrid) Vireo flavifrons x solitariusLast observed by Chad Witko on 11 Oct 2022
- Philadelphia x Red-eyed Vireo (hybrid) Vireo philadelphicus x olivaceusLast observed by Matt Brady on 9 Sep 2008
- Warbling x Red-eyed Vireo (hybrid) Vireo gilvus x olivaceusLast observed by Steven Mlodinow on 24 May 2016
- Steller's x Blue Jay (hybrid) Cyanocitta stelleri x cristataLast observed by Chris Knight on 29 Dec 2023
- Steller's Jay x Woodhouse's Scrub-Jay (hybrid) Cyanocitta stelleri x Aphelocoma woodhouseiiLast observed by Amy Lunde on 13 Apr 2023
- House x Fish Crow (hybrid) Corvus splendens x ossifragusLast observed by John Groskopf on 3 Jul 2020
- Carolina x Black-capped Chickadee (hybrid) Poecile carolinensis x atricapillusLast observed by WCAS Audubon on 3 Jun 2024
- Black-capped x Mountain Chickadee (hybrid) Poecile atricapillus x gambeliLast observed by Eric Heisey on 17 May 2024
- Mountain x Mexican Chickadee (hybrid) Poecile gambeli x sclateriLast observed by Richard Webster on 30 Dec 2023
- Mountain x Chestnut-backed Chickadee (hybrid) Poecile gambeli x rufescensLast observed by Elizabeth Schreiner on 31 Jan 2022
- Mountain x Boreal Chickadee (hybrid) Poecile gambeli x hudsonicusLast observed by tom aversa on 6 Aug 1997
- Tufted x Black-crested Titmouse (hybrid) Baeolophus bicolor x atricristatusLast observed by Rita Johnston on 3 Jun 2024
- Tree x Violet-green Swallow (hybrid) Tachycineta bicolor x thalassinaLast observed by Steven Mlodinow on 1 Aug 2010
- Violet-green x Northern Rough-winged Swallow (hybrid) Tachycineta thalassina x Stelgidopteryx serripennisLast observed by Steven Mlodinow on 4 Jul 2012
- Tree x Barn Swallow (hybrid) Tachycineta bicolor x Hirundo rusticaLast observed by Gjon Hazard on 16 Apr 1997
- Barn x Cliff Swallow (hybrid) Hirundo rustica x Petrochelidon pyrrhonotaLast observed by Van Remsen on 17 Aug 2023
- Violet-green x Cliff Swallow (hybrid) Tachycineta thalassina x Petrochelidon pyrrhonotaLast observed by Steven Mlodinow on 25 Jul 2010
- Barn x Cave Swallow (hybrid) Hirundo rustica x Petrochelidon fulvaLast observed by Garrett Trapp on 23 Jul 2023
- Cliff x Cave Swallow (hybrid) Petrochelidon pyrrhonota x fulvaLast observed by Doug Gochfeld on 29 Apr 2018
- Red-whiskered x Red-vented Bulbul (hybrid) Pycnonotus jocosus x caferLast observed by Steven Kurniawidjaja on 16 Jan 2024
- Black-tailed x Black-capped Gnatcatcher (hybrid) Polioptila melanura x nigricepsLast observed by Mark Stevenson on 5 Apr 1999
- Curve-billed x Long-billed Thrasher (hybrid) Toxostoma curvirostre x longirostreLast observed by Tom Unsicker on 23 Feb 2022
- California x Crissal Thrasher (hybrid) Toxostoma redivivum x crissaleLast observed by Sonja Kramer on 7 Apr 2022
- Bahama x Northern Mockingbird (hybrid) Mimus gundlachii x polyglottosLast observed by Seabird McKeon on 20 Aug 2023
- Tropical x Northern Mockingbird (hybrid) Mimus gilvus x polyglottosLast observed by Fred Collins on 1 May 2015
- Eastern x Mountain Bluebird (hybrid) Sialia sialis x currucoidesLast observed by Tony Lammers on 20 Apr 2022
- Western x Mountain Bluebird (hybrid) Sialia mexicana x currucoidesLast observed by Josh McLaughlin on 3 Feb 2023
- Veery x Bicknell's Thrush (hybrid) Catharus fuscescens x bicknelliLast observed by Kent McFarland on 25 Jun 2008
- House x Eurasian Tree Sparrow (hybrid) Passer domesticus x montanusLast observed by Chris Krafft on 2 Jun 2024
- Gray-crowned x Black Rosy-Finch (hybrid) Leucosticte tephrocotis x atrataLast observed by Steven Mlodinow on 9 Jan 2024
- House x Purple Finch (hybrid) Haemorhous mexicanus x purpureusLast observed by Tracy Wiczer on 23 Mar 2024
- Common x Hoary Redpoll (hybrid) Acanthis flammea x hornemanniLast observed by Cameron Cox on 27 Sep 2017
- Red Crossbill x Pine Siskin (hybrid) Loxia curvirostra x Spinus pinusLast observed by Sam Manning on 25 Nov 2012
- Pine Siskin x American Goldfinch (hybrid) Spinus pinus x tristisLast observed by Anne Brown on 4 Jun 2023
- Lesser x American Goldfinch (hybrid) Spinus psaltria x tristisLast observed by Sally Hill on 25 Oct 2019
- Snow x McKay's Bunting (hybrid) Plectrophenax nivalis x hyperboreusLast observed by Paul Lehman on 11 Jun 2018
- Chipping x Clay-colored Sparrow (hybrid) Spizella passerina x pallidaLast observed by Deborah Dohne on 6 Sep 2019
- Chipping x Field Sparrow (hybrid) Spizella passerina x pusillaLast observed by Steven Mlodinow on 12 Sep 2020
- Clay-colored x Field Sparrow (hybrid) Spizella pallida x pusillaLast observed by terence zahner on 1 Oct 2021
- Clay-colored x Brewer's Sparrow (hybrid) Spizella pallida x breweriLast observed by Steven Mlodinow on 4 May 2015
- Dark-eyed x Yellow-eyed Junco (hybrid) Junco hyemalis x phaeonotusLast observed by Matt Brady on 19 Jun 2022
- Dark-eyed Junco x White-crowned Sparrow (hybrid) Junco hyemalis x Zonotrichia leucophrysLast observed by Carol Comeau on 9 Feb 2023
- White-crowned x Golden-crowned Sparrow (hybrid) Zonotrichia leucophrys x atricapillaLast observed by Josh Snead on 23 Apr 2024
- White-crowned x Harris's Sparrow (hybrid) Zonotrichia leucophrys x querulaLast observed by Mason Maron on 12 May 2023
- White-crowned x White-throated Sparrow (hybrid) Zonotrichia leucophrys x albicollisLast observed by Roger Adamson on 6 Feb 2024
- Golden-crowned x White-throated Sparrow (hybrid) Zonotrichia atricapilla x albicollisLast observed by Douglas Herr on 30 Dec 2023
- Dark-eyed Junco x White-throated Sparrow (hybrid) Junco hyemalis x Zonotrichia albicollisLast observed by Joel Throckmorton on 20 May 2024
- Nelson's x Saltmarsh Sparrow (hybrid) Ammospiza nelsoni x caudacutaLast observed by Scott Olmstead on 7 Jun 2023
- Grasshopper x Savannah Sparrow (hybrid) Ammodramus savannarum x Passerculus sandwichensisLast observed by Benjamin Griffith on 20 Mar 2022
- Song x Swamp Sparrow (hybrid) Melospiza melodia x georgianaLast observed by Steven Mlodinow on 18 Oct 2007
- Canyon x Spotted Towhee (hybrid) Melozone fusca x Pipilo maculatusLast observed by Jim Merritt on 1 May 2024
- Green-tailed x Spotted Towhee (hybrid) Pipilo chlorurus x maculatusLast observed by J Joseph on 14 Aug 2021
- Spotted x Eastern Towhee (hybrid) Pipilo maculatus x erythrophthalmusLast observed by Tobin Brown on 30 May 2024
- Western x Eastern Meadowlark (hybrid) Sturnella neglecta x magnaLast observed by Steven Mlodinow on 17 Apr 2021
- Western x Chihuahuan Meadowlark (hybrid) Sturnella neglecta x lilianaeLast observed by Christian Nunes on 14 Jun 2023
- Altamira x Audubon's Oriole (hybrid) Icterus gularis x graduacaudaLast observed by Andrew Mackenzie on 26 May 2024
- Bullock's x Baltimore Oriole (hybrid) Icterus bullockii x galbulaLast observed by Tom Curtis on 3 Jun 2024
- Yellow-breasted Chat x new world oriole sp. (hybrid) Icteria virens x Icterus sp.Last observed by Matthew Grube on 23 Jul 2022
- Brewer's Blackbird x Great-tailed Grackle (hybrid) Euphagus cyanocephalus x Quiscalus mexicanusLast observed by Brian Daniels on 14 May 1999
- Common x Great-tailed Grackle (hybrid) Quiscalus quiscula x mexicanusLast observed by Wyatt Egelhoff on 24 Feb 2023
- Boat-tailed x Great-tailed Grackle (hybrid) Quiscalus major x mexicanusLast observed by Daniel Lane on 10 Jan 2023
- Golden-winged x Blue-winged Warbler (hybrid) Vermivora chrysoptera x cyanopteraLast observed by Kristin Mylecraine on 3 Jun 2024
- Brewster's Warbler (hybrid) Vermivora chrysoptera x cyanoptera (F1 hybrid)Last observed by Betty Simon on 3 Jun 2024
- Lawrence's Warbler (hybrid) Vermivora chrysoptera x cyanoptera (F2 backcross)Last observed by John Roth on 2 Jun 2024
- Colima x Virginia's Warbler (hybrid) Leiothlypis crissalis x virginiaeLast observed by Nick Vinciguerra on 3 Jul 2023
- MacGillivray's x Mourning Warbler (hybrid) Geothlypis tolmiei x philadelphiaLast observed by Jack Bushong on 11 May 2024
- Gray-crowned x Common Yellowthroat (hybrid) Geothlypis poliocephala x trichasLast observed by Michael O'Brien on 27 Apr 2006
- MacGillivray's Warbler x Common Yellowthroat (hybrid) Geothlypis tolmiei x trichasLast observed by Dale Fisher on 12 Apr 2023
- Mourning Warbler x Common Yellowthroat (hybrid) Geothlypis philadelphia x trichasLast observed by Cole Winstanley on 16 May 2021
- Kentucky Warbler x Common Yellowthroat (hybrid) Geothlypis formosa x trichasLast observed by Port of Baltimore on 16 Aug 2021
- American Redstart x Northern Parula (hybrid) Setophaga ruticilla x americanaLast observed by Jerald Reb on 16 Jun 2021
- Cerulean Warbler x Northern Parula (hybrid) Setophaga cerulea x americanaLast observed by Holly Peterson on 15 May 2024
- Northern x Tropical Parula (hybrid) Setophaga americana x pitiayumiLast observed by Nancy Webber on 31 May 2024
- Cape May x Magnolia Warbler (hybrid) Setophaga tigrina x magnoliaLast observed by Dan Jones on 24 Apr 2023
- Common Yellowthroat x Yellow Warbler (hybrid) Geothlypis trichas x Setophaga petechiaLast observed by Don Roberson on 20 Sep 2006
- Hooded x Yellow Warbler (hybrid) Setophaga citrina x petechiaLast observed by Aaron Shipe on 21 May 2017
- American Redstart x Yellow Warbler (hybrid) Setophaga ruticilla x petechiaLast observed by Farallon Island on 5 Sep 2020
- Bay-breasted x Blackpoll Warbler (hybrid) Setophaga castanea x striataLast observed by Sara Gravatt-Wimsatt on 11 Jun 2023
- Yellow x Black-throated Blue Warbler (hybrid) Setophaga petechia x caerulescensLast observed by Mike Andersen on 17 Sep 2020
- Chestnut-sided x Black-throated Blue Warbler (hybrid) Setophaga pensylvanica x caerulescensLast observed by Billy Weber on 11 May 2019
- Magnolia x Palm Warbler (hybrid) Setophaga magnolia x palmarumLast observed by John Groskopf on 9 Apr 2020
- Cape May x Yellow-rumped Warbler (hybrid) Setophaga tigrina x coronataLast observed by Haley Gottardo on 10 Oct 2019
- Magnolia x Yellow-rumped Warbler (hybrid) Setophaga magnolia x coronataLast observed by Brian Daniels on 16 Mar 2024
- Palm x Yellow-rumped Warbler (hybrid) Setophaga palmarum x coronataLast observed by Bryant Olsen on 31 Aug 2020
- Northern Parula x Yellow-throated Warbler (hybrid) Setophaga americana x dominicaLast observed by Tom Ross on 6 May 2023
- Yellow-rumped x Yellow-throated Warbler (hybrid) Setophaga coronata x dominicaLast observed by Simon Lane on 22 Apr 2018
- Blue-winged x Prairie Warbler (hybrid) Vermivora cyanoptera x Setophaga discolorLast observed by Jonathan Lautenbach on 5 Jun 2014
- Yellow x Prairie Warbler (hybrid) Setophaga petechia x discolorLast observed by Rachel DiPietro on 15 May 2021
- Yellow-rumped x Grace's Warbler (hybrid) Setophaga coronata x graciaeLast observed by Luke Pheneger on 13 May 2023
- Northern Parula x Black-throated Gray Warbler (hybrid) Setophaga americana x nigrescensLast observed by Nathan Goldberg on 17 Jun 2023
- Yellow-rumped x Black-throated Gray Warbler (hybrid) Setophaga coronata x nigrescensLast observed by Rob MacDonald on 16 May 2024
- Grace's x Black-throated Gray Warbler (hybrid) Setophaga graciae x nigrescensLast observed by Jay Packer on 27 May 2007
- Yellow-rumped x Townsend's Warbler (hybrid) Setophaga coronata x townsendiLast observed by Ramsey Canyon on 31 Jan 2024
- Black-throated Gray x Townsend's Warbler (hybrid) Setophaga nigrescens x townsendiLast observed by Mark Sawyer on 18 Mar 2024
- Yellow-rumped x Hermit Warbler (hybrid) Setophaga coronata x occidentalisLast observed by Scott Logan on 8 Oct 2023
- Black-throated Gray x Hermit Warbler (hybrid) Setophaga nigrescens x occidentalisLast observed by Sam Zuckerman on 23 Apr 2023
- Townsend's x Hermit Warbler (hybrid) Setophaga townsendi x occidentalisLast observed by Peter Miller on 3 Jun 2024
- Townsend's x Black-throated Green Warbler (hybrid) Setophaga townsendi x virensLast observed by Matt DuRoss on 29 Apr 2024
- Common Yellowthroat x Rufous-capped Warbler (hybrid) Geothlypis trichas x Basileuterus rufifronsLast observed by Steve Collins on 9 May 2013
- Painted x Slate-throated Redstart (hybrid) Myioborus pictus x miniatusLast observed by Ryan Shaw on 16 Jul 2016
- Summer x Scarlet Tanager (hybrid) Piranga rubra x olivaceaLast observed by Michael Willison on 18 May 2020
- Summer x Western Tanager (hybrid) Piranga rubra x ludovicianaLast observed by Rose Ann Rowlett on 24 Oct 2022
- Scarlet x Western Tanager (hybrid) Piranga olivacea x ludovicianaLast observed by Richard Hunter on 15 Apr 2024
- Hepatic x Flame-colored Tanager (hybrid) Piranga flava x bidentataLast observed by Doug Lake on 30 Apr 2004
- Western x Flame-colored Tanager (hybrid) Piranga ludoviciana x bidentataLast observed by Dan Hoobler on 11 Sep 2023
- Northern Cardinal x Pyrrhuloxia (hybrid) Cardinalis cardinalis x sinuatusLast observed by Dave Cleary on 23 Apr 2024
- Scarlet Tanager x Rose-breasted Grosbeak (hybrid) Piranga olivacea x Pheucticus ludovicianusLast observed by Tom Johnson on 11 Jun 2020
- Rose-breasted x Black-headed Grosbeak (hybrid) Pheucticus ludovicianus x melanocephalusLast observed by Alane Gray on 30 May 2024
- Lazuli x Indigo Bunting (hybrid) Passerina amoena x cyaneaLast observed by Alex Patia on 3 Jun 2024
- Indigo x Painted Bunting (hybrid) Passerina cyanea x cirisLast observed by John Taylor on 12 Feb 2022
- Varied x Painted Bunting (hybrid) Passerina versicolor x cirisLast observed by Joan Spaw on 28 Apr 2022
Additional Taxa (479)
- Greater/Lesser White-fronted Goose Anser albifrons/erythropusLast observed by Noah Arthur on 12 Feb 2022
- Domestic goose sp. (Domestic type) Anser sp. (Domestic type)Last observed by Dorothy Tate on 3 Jun 2024
- Mallard/American Black Duck Anas platyrhynchos/rubripesLast observed by Tim Shelmerdine on 3 Jun 2024
- Garganey/Green-winged Teal Spatula querquedula/Anas creccaLast observed by Lance Tanino on 19 Mar 2015
- Velvet/White-winged/Stejneger's Scoter Melanitta fusca/deglandi/stejnegeriLast observed by Brenda Moulton on 22 Feb 2020
- White-winged/Stejneger's Scoter Melanitta deglandi/stejnegeriLast observed by Daniel López-Velasco | Ornis Birding Expeditions on 3 Jun 2024
- Common/Barrow's Goldeneye Bucephala clangula/islandicaLast observed by Michelle Beadle on 2 Jun 2024
- Masked/Ruddy Duck Nomonyx dominicus/Oxyura jamaicensisLast observed by Denise Schneider on 11 Feb 2024
- California/Gambel's Quail Callipepla californica/gambeliiLast observed by Patricia M Miller on 14 May 2024
- Greater/Gunnison Sage-Grouse Centrocercus urophasianus/minimusLast observed by Doug Kibbe on 4 Jun 2007
- Greater/Lesser Prairie-Chicken Tympanuchus cupido/pallidicinctusLast observed by Bob & Anne Watson on 5 May 2024
- Ruffed/Spruce Grouse Bonasa umbellus/Canachites canadensisLast observed by Kim Söderling on 30 May 2024
- Ring-necked/Green Pheasant Phasianus colchicus/versicolorLast observed by Wendy Swee on 28 May 2024
- francolin/spurfowl sp. Phasianidae sp. (francolin/spurfowl sp.)Last observed by Genevieve Sicree on 28 May 2024
- American/Greater Flamingo Phoenicopterus ruber/roseusLast observed by Jordan FitzGerald on 7 Jan 2024
- Rock/Band-tailed Pigeon Columba livia/Patagioenas fasciataLast observed by Jean Olson on 1 Jun 2024
- Eurasian/African Collared-Dove Streptopelia decaocto/roseogriseaLast observed by Srivatsan Subramanian on 23 May 2024
- Smooth-billed/Groove-billed Ani Crotophaga ani/sulcirostrisLast observed by Dan O'Malley on 1 Sep 2023
- Lesser/Greater Roadrunner Geococcyx velox/californianusLast observed by Anonymous eBirder on 10 Feb 2021
- Yellow-billed/Black-billed Cuckoo Coccyzus americanus/erythropthalmusLast observed by Jessica Sauder on 3 Jun 2024
- Eastern/Mexican Whip-poor-will Antrostomus vociferus/arizonaeLast observed by Matt Baumann on 13 Apr 2024
- Ruby-throated/Black-chinned Hummingbird Archilochus colubris/alexandriLast observed by Kelly Ducham on 3 Jun 2024
- Ridgway's/Mangrove/Clapper Rail Rallus obsoletus/longirostris/crepitansLast observed by Charles Babbitt on 26 May 2022
- Eurasian Moorhen/Common Gallinule Gallinula chloropus/galeataLast observed by William Cormack on 14 Mar 2024
- moorhen/coot/gallinule sp. Gallinula/Fulica/Porphyrio sp.Last observed by Gautam Apte on 14 May 2024
- American/Black Oystercatcher Haematopus palliatus/bachmaniLast observed by Naresh Satyan on 19 May 2024
- American/Pacific Golden-Plover (Lesser Golden-Plover) Pluvialis dominica/fulvaLast observed by Nat Drumheller on 30 May 2024
- Black-bellied Plover/golden-plover sp. Pluvialis sp.Last observed by Christopher Tomera on 2 Jun 2024
- Common Ringed/Semipalmated Plover Charadrius hiaticula/semipalmatusLast observed by Doug Gochfeld on 7 May 2024
- sand-plover sp. Anarhynchus atrifrons/mongolus/leschenaultiiLast observed by Kathy Borshanian on 10 Aug 2023
- Snowy/Kentish Plover Anarhynchus nivosus/alexandrinusLast observed by Alaska Historical Records on 23 May 1991
- Short-billed/Long-billed Dowitcher Limnodromus griseus/scolopaceusLast observed by Veronica Varela on 3 Jun 2024
- Red/Red-necked Phalarope Phalaropus fulicarius/lobatusLast observed by Stella Solasz on 31 May 2024
- Red-necked/Little Stint Calidris ruficollis/minutaLast observed by Jonah Benningfield on 14 Aug 2023
- Sharp-tailed/Pectoral Sandpiper Calidris acuminata/melanotosLast observed by Sam Phillips on 5 Nov 2023
- Western/Semipalmated Sandpiper Calidris mauri/pusillaLast observed by Nick Hajdukovich on 4 Jun 2024
- large shorebird sp. Scolopacidae sp. (large shorebird sp.)Last observed by Rudyard Wallen on 1 Jun 2024
- Long-tailed/Parasitic Jaeger Stercorarius longicaudus/parasiticusLast observed by Eric Konkol on 18 May 2024
- Long-tailed/Pomarine Jaeger Stercorarius longicaudus/pomarinusLast observed by Steven Weiss on 2 Sep 2023
- Parasitic/Pomarine Jaeger Stercorarius parasiticus/pomarinusLast observed by William Legge on 2 Jun 2024
- Scripps's/Guadalupe Murrelet (Xantus's Murrelet) Synthliboramphus scrippsi/hypoleucusLast observed by Alison Vilag on 15 Dec 2023
- Scripps's/Craveri's Murrelet Synthliboramphus scrippsi/craveriLast observed by Bruce Rideout on 18 May 2024
- Scripps's/Guadalupe/Craveri's Murrelet Synthliboramphus scrippsi/hypoleucus/craveriLast observed by Bruce Rideout on 30 Sep 2023
- Black-legged/Red-legged Kittiwake Rissa tridactyla/brevirostrisLast observed by Mariah Hryniewich on 2 Jun 2024
- Yellow-footed/Western Gull Larus livens/occidentalisLast observed by Patricia Gordon on 25 Jan 2024
- Herring/Lesser Black-backed Gull Larus argentatus/fuscusLast observed by Maggie Hatch on 13 May 2024
- Yellow-legged/Lesser Black-backed Gull Larus michahellis/fuscusLast observed by Doug Gochfeld on 24 Dec 2020
- Herring/Glaucous-winged Gull Larus argentatus/glaucescensLast observed by Nathan Senner on 2 Jun 2024
- Western/Glaucous-winged Gull Larus occidentalis/glaucescensLast observed by Spencer Hildie on 3 Jun 2024
- white-winged gull sp. Larus sp. (white-winged gull sp.)Last observed by Matt Anthony on 27 May 2024
- Sooty/Bridled Tern Onychoprion fuscatus/anaethetusLast observed by Luis "Beto" Matheus on 25 May 2024
- Red-billed/Red-tailed Tropicbird Phaethon aethereus/rubricaudaLast observed by Kari Cieszkiewicz on 19 Mar 2022
- Snowy/Tristan/Antipodean Albatross Diomedea exulans/dabbenena/antipodensisLast observed by CBRC Review Species on 12 Jul 1967
- Atlantic/Indian Yellow-nosed Albatross Thalassarche chlororhynchos/carteriLast observed by William McKinney on 26 Sep 2003
- White-capped/Salvin's/Chatham Albatross Thalassarche cauta/salvini/eremitaLast observed by Martin Meyers on 17 Sep 2000
- Leach's/Townsend's Storm-Petrel Hydrobates leucorhous/socorroensisLast observed by David Pereksta on 7 Sep 2023
- Leach's/Townsend's Storm-Petrel (dark-rumped) Hydrobates leucorhous/socorroensis (dark-rumped)Last observed by Curtis Marantz on 6 Aug 2023
- Leach's/Townsend's Storm-Petrel (white-rumped) Hydrobates leucorhous/socorroensis (white-rumped)Last observed by Bruce Rideout on 30 Sep 2023
- Leach's/Townsend's/Ainley's Storm-Petrel Hydrobates leucorhous/socorroensis/cheimomnestesLast observed by Paul Mulholland on 11 Jan 2024
- Hydrobates sp. (Band-rumped complex) Hydrobates sp. (Band-rumped complex)Last observed by Don-Jean Léandri-Breton on 22 Jul 2021
- storm-petrel sp. (dark-rumped) Oceanitidae/Hydrobatidae sp. (dark-rumped)Last observed by Curtis Marantz on 4 May 2024
- storm-petrel sp. (white-rumped) Oceanitidae/Hydrobatidae sp. (white-rumped)Last observed by Janet Millard on 8 May 2024
- Trindade/Herald Petrel Pterodroma arminjoniana/heraldicaLast observed by John F. Gatchet on 7 Jun 2003
- Galapagos/Hawaiian Petrel (Dark-rumped Petrel) Pterodroma phaeopygia/sandwichensisLast observed by Curtis Marantz on 4 May 2018
- Cory's/Cape Verde Shearwater Calonectris diomedea/edwardsiiLast observed by Jay McGowan on 26 Jun 2023
- Cory's/Great Shearwater Calonectris diomedea/Ardenna gravisLast observed by Evan Ladouceur on 29 May 2024
- Sooty/Short-tailed Shearwater Ardenna grisea/tenuirostrisLast observed by Odysseas Froilán Papageorgiou on 27 May 2024
- black-and-white shearwater sp. Puffinus sp. (black-and-white shearwater sp.)Last observed by Jared Smith on 1 Jun 2024
- Great/Double-crested Cormorant Phalacrocorax carbo/Nannopterum auritumLast observed by Anonymous eBirder on 1 Jun 2024
- Double-crested/Neotropic Cormorant Nannopterum auritum/brasilianumLast observed by Cristina Armas on 3 Jun 2024
- Yellow-crowned/Black-crowned Night Heron Nycticorax nycticorax/Nyctanassa violaceaLast observed by Gary Taylor on 3 Jun 2024
- Western/Eastern Cattle Egret Bubulcus ibis/coromandusLast observed by Bonnie McIntosh on 1 May 2024
- Western Cattle/Yellow-billed Egret Bubulcus ibis/Ardea brachyrhynchaLast observed by A.Trice Berkley,III on 7 Nov 2023
- Mississippi/Plumbeous Kite Ictinia mississippiensis/plumbeaLast observed by Randy Robinson on 10 May 2019
- Cooper's Hawk/American Goshawk Accipiter cooperii/atricapillusLast observed by Marcia Suchy on 30 May 2024
- Golden/Bald Eagle Aquila chrysaetos/Haliaeetus leucocephalusLast observed by Dianne Simonds on 3 Jun 2024
- Red-shouldered/Broad-winged Hawk Buteo lineatus/platypterusLast observed by Buffy Silverman on 3 Jun 2024
- pygmy-owl/saw-whet owl sp. Glaucidium/Aegolius sp. (pygmy-owl/saw-whet owl sp.)Last observed by Matthew Daw on 4 Jul 2023
- Yellow-casqued/Black-casqued Hornbill Ceratogymna elata/atrataLast observed by James Erdman on 19 Apr 2024
- Yellow-bellied/Red-naped Sapsucker Sphyrapicus varius/nuchalisLast observed by Rose Ann Rowlett on 18 May 2024
- Red-naped/Red-breasted Sapsucker Sphyrapicus nuchalis/ruberLast observed by bob hunter on 2 Jun 2024
- Golden-fronted/Red-bellied Woodpecker Melanerpes aurifrons/carolinusLast observed by Christian Walker on 2 Jun 2024
- American Three-toed/Black-backed Woodpecker Picoides dorsalis/arcticusLast observed by Yuancheng Yang on 19 May 2024
- Downy/Ladder-backed Woodpecker Dryobates pubescens/scalarisLast observed by Kenneth Bader on 1 Jun 2024
- Nuttall's/Ladder-backed Woodpecker Dryobates nuttallii/scalarisLast observed by Matthew Grube on 1 Jun 2024
- diurnal raptor sp. Accipitriformes/Falconiformes sp.Last observed by Cathy Pasterczyk on 3 Jun 2024
- rainbow lorikeet sp. Trichoglossus sp. (rainbow lorikeet complex)Last observed by Bruce Neville on 16 Jun 1990
- Domestic lovebird sp. (Domestic type) Agapornis sp. (Domestic type)Last observed by Graeme Hinde on 5 Mar 2024
- White-winged/Yellow-chevroned Parakeet Brotogeris versicolurus/chiririLast observed by Steve Field on 11 May 2024
- Red-crowned/Lilac-crowned Parrot Amazona viridigenalis/finschiLast observed by Michelle Haglund on 2 Jun 2024
- Scarlet-fronted/Cordilleran Parakeet Psittacara wagleri/frontatusLast observed by Tom Marvel on 10 Jul 2022
- Mitred/Red-masked Parakeet Psittacara mitratus/erythrogenysLast observed by Calvin Bonn on 12 May 2024
- large parakeet sp. (former Aratinga sp.) Eupsittula/Aratinga/Thectocercus/Psittacara sp.Last observed by Mark Hunter on 5 May 2024
- Alder/Willow Flycatcher (Traill's Flycatcher) Empidonax alnorum/trailliiLast observed by Luke Donahue on 3 Jun 2024
- Hammond's/Dusky Flycatcher Empidonax hammondii/oberholseriLast observed by Amber Zelmer on 3 Jun 2024
- Ash-throated/Nutting's Flycatcher Myiarchus cinerascens/nuttingiLast observed by Erin Bowen on 22 Dec 2019
- Streaked/Sulphur-bellied Flycatcher Myiodynastes maculatus/luteiventrisLast observed by FOS Records Committee on 12 Oct 1991
- Cassin's/Western Kingbird Tyrannus vociferans/verticalisLast observed by Andrea Bruce on 2 Jun 2024
- Philadelphia/Red-eyed Vireo Vireo philadelphicus/olivaceusLast observed by Liz Harper on 2 Jun 2024
- Red-eyed/Yellow-green Vireo Vireo olivaceus/flavoviridisLast observed by Martin Dellwo on 5 Nov 2023
- Red-eyed/Black-whiskered Vireo Vireo olivaceus/altiloquusLast observed by Beth Price on 27 Apr 2023
- vireo sp. (Red-eyed Vireo complex) Vireo sp. (Red-eyed Vireo complex)Last observed by James Teitgen on 14 Aug 2023
- Black-throated/White-throated Magpie-Jay Calocitta colliei/formosaLast observed by Dan Jessen on 28 Mar 2020
- California/Woodhouse's Scrub-Jay Aphelocoma californica/woodhouseiiLast observed by Aidan Brubaker on 3 Jun 2024
- Carolina/Black-capped Chickadee Poecile carolinensis/atricapillusLast observed by Peter G. Saenger on 4 Jun 2024
- Black-capped/Mountain Chickadee Poecile atricapillus/gambeliLast observed by Joe Girgente on 3 Jun 2024
- Oak/Juniper Titmouse (Plain Titmouse) Baeolophus inornatus/ridgwayiLast observed by Joan MacDonald on 21 May 2024
- Tufted/Black-crested Titmouse Baeolophus bicolor/atricristatusLast observed by Jane Tillman on 3 Jun 2024
- Red-whiskered/Red-vented Bulbul Pycnonotus jocosus/caferLast observed by Jacco Gelderloos on 28 May 2024
- Arctic/Kamchatka Leaf Warbler Phylloscopus borealis/examinandusLast observed by Amin Khalifa on 20 Sep 2020
- Japanese Leaf/Arctic/Kamchatka Leaf Warbler Phylloscopus xanthodryas/borealis/examinandusLast observed by Oregon Bird Records Committee OBRC on 26 Sep 2020
- old world warbler sp. Passeriformes sp. (Old World warbler sp.)Last observed by Luke Pheneger on 16 Jun 2022
- Ruby-crowned/Golden-crowned Kinglet Corthylio calendula/Regulus satrapaLast observed by Bruce Pasfield on 2 Jun 2024
- Brown/Long-billed Thrasher Toxostoma rufum/longirostreLast observed by Alexander Neal on 1 May 2024
- Curve-billed/Bendire's Thrasher Toxostoma curvirostre/bendireiLast observed by Thomas Bingham on 3 Jun 2024
- Gray-cheeked/Bicknell's Thrush Catharus minimus/bicknelliLast observed by Efua Peterson on 1 Jun 2024
- Varied Thrush/American Robin Ixoreus naevius/Turdus migratoriusLast observed by Lisa Engeseth on 1 Jun 2024
- Gray-streaked/Dark-sided Flycatcher Muscicapa griseisticta/sibiricaLast observed by Suzi Golodoff on 7 Sep 2020
- Siberian/Amur Stonechat Saxicola maurus/stejnegeriLast observed by San Clemente Island Historic Records on 21 Oct 1995
- House/Eurasian Tree Sparrow Passer domesticus/montanusLast observed by Timothty Gollob on 22 May 2024
- Western/Eastern Yellow Wagtail Motacilla flava/tschutschensisLast observed by Alabama Ornithological Society Bird Records Committee on 29 Sep 2003
- Snow/McKay's Bunting Plectrophenax nivalis/hyperboreusLast observed by Nathan Dubrow on 25 May 2024
- Spizella sp./American Tree Sparrow Spizella/Spizelloides sp.Last observed by Jim Cassidy on 2 Jun 2024
- White-crowned/White-throated Sparrow Zonotrichia leucophrys/albicollisLast observed by Loyan Beausoleil on 25 May 2024
- Sagebrush/Bell's Sparrow (Sage Sparrow) Artemisiospiza nevadensis/belliLast observed by Deborah House on 28 May 2024
- Nelson's/Saltmarsh Sparrow (Sharp-tailed Sparrow) Ammospiza nelsoni/caudacutaLast observed by Bill Hancock on 3 Jun 2024
- Grasshopper/Baird's Sparrow Ammodramus savannarum/Centronyx bairdiiLast observed by David Griffin on 27 Mar 2024
- Grasshopper/Henslow's Sparrow Ammodramus savannarum/Centronyx henslowiiLast observed by Kathy Mineck on 6 Oct 2022
- Lincoln's/Swamp Sparrow Melospiza lincolnii/georgianaLast observed by Jeffrey Girven on 28 May 2024
- Spotted/Eastern Towhee (Rufous-sided Towhee) Pipilo maculatus/erythrophthalmusLast observed by Dylan Dell-Haro on 3 Jun 2024
- Western/Chihuahuan Meadowlark Sturnella neglecta/lilianaeLast observed by Evan Buechley on 1 Jun 2024
- Eastern/Chihuahuan Meadowlark Sturnella magna/lilianaeLast observed by Cheryl Niemeier on 30 Apr 2024
- Bullock's/Black-backed Oriole Icterus bullockii/abeilleiLast observed by Steven Mlodinow on 21 Jun 2022
- Red-winged/Tricolored Blackbird Agelaius phoeniceus/tricolorLast observed by Brad Rumble on 3 Jun 2024
- Rusty/Brewer's Blackbird Euphagus carolinus/cyanocephalusLast observed by Joe McDonnell on 2 Jun 2024
- Boat-tailed/Great-tailed Grackle Quiscalus major/mexicanusLast observed by Harlan Stewart on 2 Jun 2024
- Chipping Sparrow/Worm-eating Warbler Spizella passerina/Helmitheros vermivorumLast observed by Bob Abbott on 29 May 2024
- Louisiana/Northern Waterthrush Parkesia motacilla/noveboracensisLast observed by Anonymous eBirder on 3 Jun 2024
- Golden-winged/Blue-winged Warbler Vermivora chrysoptera/cyanopteraLast observed by Irene Mazzocchi on 3 Jun 2024
- Connecticut/MacGillivray's/Mourning Warbler Oporornis/Geothlypis sp. (Mourning-type)Last observed by Jelmer Poelstra on 20 May 2024
- MacGillivray's/Mourning Warbler Geothlypis tolmiei/philadelphiaLast observed by Simon Tolzmann on 29 May 2024
- Bay-breasted/Blackpoll Warbler Setophaga castanea/striataLast observed by Kathi Hoffman on 24 May 2024
- Dark-eyed Junco/Pine Warbler Junco hyemalis/Setophaga pinusLast observed by Shey Claflin on 3 May 2024
- Black-throated Gray/Townsend's Warbler Setophaga nigrescens/townsendiLast observed by Eric Hope on 1 Jun 2024
- Black-throated Gray/Hermit Warbler Setophaga nigrescens/occidentalisLast observed by Jacob Crawford on 26 May 2024
- Black-throated Gray/Townsend's/Hermit Warbler Setophaga nigrescens/townsendi/occidentalisLast observed by Dominik Mosur on 16 May 2024
- Townsend's/Hermit Warbler Setophaga townsendi/occidentalisLast observed by Kyle Landstra on 3 Jun 2024
- sparrow/warbler sp. (trilling song) Passerellidae/Parulidae sp. (trilling song)Last observed by KZ F on 25 May 2024
- Northern Cardinal/Pyrrhuloxia Cardinalis cardinalis/sinuatusLast observed by Tristan McKnight on 3 Jun 2024
- Rose-breasted/Black-headed Grosbeak Pheucticus ludovicianus/melanocephalusLast observed by Alison Hiers on 1 Jun 2024
- tanager sp. (Thraupidae sp.) Thraupidae sp. (tanager sp.)Last observed by Joanne Wilshanetsky on 16 May 2024
- Morelet's/Cinnamon-rumped Seedeater Sporophila morelleti/torqueolaLast observed by Corinne Williams on 28 Jan 1997