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Illustrated Checklist
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Native and Naturalized (686)
Exotic: Provisional (21)
Exotic: Escapee (171)
Hybrids (130)
- 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 Dan Hayes on 19 Feb 2024
- Emperor x Cackling Goose (hybrid) Anser canagicus x Branta hutchinsiiLast observed by Gil Ewing on 11 Mar 2020
- Greater White-fronted x Cackling Goose (hybrid) Anser albifrons x Branta hutchinsiiLast observed by Ryan Janke on 11 Feb 2024
- Swan Goose x Canada Goose (hybrid) Anser cygnoides x Branta canadensisLast observed by Rick Saxton on 12 Apr 2024
- Greater White-fronted x Canada Goose (hybrid) Anser albifrons x Branta canadensisLast observed by Jeri Langham on 28 Feb 2024
- Greater White-fronted x Cackling/Canada Goose (hybrid) Anser albifrons x Branta hutchinsii/canadensisLast observed by Julie Laity on 23 Oct 2023
- Graylag x Canada Goose (hybrid) Anser anser x Branta canadensisLast observed by Donna Marciano on 22 Apr 2024
- Domestic goose sp. x Canada Goose (hybrid) Anser sp. (Domestic type) x Branta canadensisLast observed by Kaiting H on 20 Apr 2024
- Snow x Canada Goose (hybrid) Anser caerulescens x Branta canadensisLast observed by Mitchell Slivinsky on 7 Feb 2023
- Barnacle x Canada Goose (hybrid) Branta leucopsis x canadensisLast observed by Scott Sorby on 16 Apr 2015
- Blue-winged x Cinnamon Teal (hybrid) Spatula discors x cyanopteraLast observed by Jesse Sargent on 9 Apr 2024
- Blue-winged Teal x Northern Shoveler (hybrid) Spatula discors x clypeataLast observed by Adam Burnett on 21 Apr 2024
- Cinnamon Teal x Northern Shoveler (hybrid) Spatula cyanoptera x clypeataLast observed by Brian Daniels on 20 Mar 2024
- Northern Shoveler x Gadwall (hybrid) Spatula clypeata x Mareca streperaLast observed by Emmett Iverson on 20 Jan 2021
- 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 Bradley Waggoner on 24 Nov 2014
- Eurasian x American Wigeon (hybrid) Mareca penelope x americanaLast observed by Rajan Rao on 24 Mar 2024
- Muscovy Duck x Mallard (hybrid) Cairina moschata x Anas platyrhynchosLast observed by Jeffrey Fenwick on 20 Apr 2024
- Wood Duck x Mallard (hybrid) Aix sponsa x Anas platyrhynchosLast observed by Mark Stephenson on 10 Dec 2015
- Northern Shoveler x Mallard (hybrid) Spatula clypeata x Anas platyrhynchosLast observed by Wim van Dam on 26 Jul 2016
- Gadwall x Mallard (hybrid) Mareca strepera x Anas platyrhynchosLast observed by Edana Salisbury on 3 Apr 2024
- American Wigeon x Mallard (hybrid) Mareca americana x Anas platyrhynchosLast observed by Steve Tucker on 11 Jan 2024
- Mallard x Mexican Duck (hybrid) Anas platyrhynchos x diaziLast observed by Susan Steele on 15 Nov 2023
- Gadwall x Northern Pintail (hybrid) Mareca strepera x Anas acutaLast observed by Donna Pomeroy on 2 Dec 2018
- American Wigeon x Northern Pintail (hybrid) Mareca americana x Anas acutaLast observed by Bruce Deuel on 7 Jan 1982
- Mallard x Northern Pintail (hybrid) Anas platyrhynchos x acutaLast observed by Jonah Benningfield on 4 Feb 2024
- Blue-winged x Green-winged Teal (hybrid) Spatula discors x Anas creccaLast observed by Tony Godfrey on 2 Nov 2020
- 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
- Northern Pintail x Green-winged Teal (hybrid) Anas acuta x creccaLast observed by Levi Rehberg on 7 Jan 2024
- Canvasback x Redhead (hybrid) Aythya valisineria x americanaLast observed by Tony Kurz on 7 Dec 2022
- Redhead x Ring-necked Duck (hybrid) Aythya americana x collarisLast observed by Jim Rowoth on 11 Nov 2016
- Ring-necked x Tufted Duck (hybrid) Aythya collaris x fuligulaLast observed by Ethan Monk on 11 Nov 2018
- Ring-necked Duck x Greater Scaup (hybrid) Aythya collaris x marilaLast observed by Marin County Historical Record on 15 Sep 1981
- Tufted Duck x Greater Scaup (hybrid) Aythya fuligula x marilaLast observed by Mark Dettling on 18 Dec 2021
- Ring-necked Duck x Lesser Scaup (hybrid) Aythya collaris x affinisLast observed by Alex Henry on 31 Jan 2024
- Tufted Duck x Lesser Scaup (hybrid) Aythya fuligula x affinisLast observed by Murray Berner on 18 Jan 2024
- Ring-necked Duck x scaup sp. (hybrid) Aythya collaris x marila/affinisLast observed by Toby Fowler on 11 Mar 2024
- Tufted Duck x scaup sp. (hybrid) Aythya fuligula x marila/affinisLast observed by David Lumpkin on 21 Jan 2023
- Bufflehead x Common Goldeneye (hybrid) Bucephala albeola x clangulaLast observed by Jeri Langham on 21 Feb 2024
- Common x Barrow's Goldeneye (hybrid) Bucephala clangula x islandicaLast observed by Ellyn Corey on 27 Mar 2024
- Bufflehead x Hooded Merganser (hybrid) Bucephala albeola x Lophodytes cucullatusLast observed by Alison Sheehey on 14 Feb 2015
- Common Goldeneye x Hooded Merganser (hybrid) Bucephala clangula x Lophodytes cucullatusLast observed by Larry Siemens on 25 Jan 2024
- Barrow's Goldeneye x Hooded Merganser (hybrid) Bucephala islandica x Lophodytes cucullatusLast observed by Jeff Hoppes on 7 Jan 2012
- goldeneye sp. x Hooded Merganser (hybrid) Bucephala clangula/islandica x Lophodytes cucullatusLast observed by Patricia DiLuzio on 23 Dec 2018
- California x Gambel's Quail (hybrid) Callipepla californica x gambeliiLast observed by Dan Hayes on 10 Feb 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 Matt Sadowski on 24 Mar 2024
- Eurasian x African Collared-Dove (hybrid) Streptopelia decaocto x roseogriseaLast observed by Noah Arthur on 13 Apr 2023
- Eurasian Collared-Dove x Mourning Dove (hybrid) Streptopelia decaocto x Zenaida macrouraLast observed by Crystal Leslie on 10 Dec 2023
- Black-chinned x Anna's Hummingbird (hybrid) Archilochus alexandri x Calypte annaLast observed by Andrew Lee on 22 Aug 2023
- Black-chinned x Costa's Hummingbird (hybrid) Archilochus alexandri x Calypte costaeLast observed by Matthew Grube on 1 Apr 2021
- Anna's x Costa's Hummingbird (hybrid) Calypte anna x costaeLast observed by Gjon Hazard on 1 Dec 2023
- Black-chinned x Calliope Hummingbird (hybrid) Archilochus alexandri x Selasphorus calliopeLast observed by Chris Howard on 23 Apr 2023
- Anna's x Calliope Hummingbird (hybrid) Calypte anna x Selasphorus calliopeLast observed by Bryan McIntosh on 20 Apr 2017
- Black-chinned x Rufous Hummingbird (hybrid) Archilochus alexandri x Selasphorus rufusLast observed by Colin Dillingham on 27 Apr 2017
- Anna's x Rufous Hummingbird (hybrid) Calypte anna x Selasphorus rufusLast observed by Scott Carey on 6 Sep 2020
- Calliope x Rufous Hummingbird (hybrid) Selasphorus calliope x rufusLast observed by Paul Fenwick on 18 Apr 2020
- 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 Kellen Apuna on 7 Apr 2023
- Anna's Hummingbird x Selasphorus sp. (hybrid) Calypte anna x Selasphorus sp.Last observed by Sylvia Afable on 28 Mar 2024
- Costa's x Broad-billed Hummingbird (hybrid) Calypte costae x Cynanthus latirostrisLast observed by Konshau Duman on 13 Aug 2020
- Common Gallinule x American Coot (hybrid) Gallinula galeata x Fulica americanaLast observed by julia hartlage on 9 Nov 2021
- American x Black Oystercatcher (hybrid) Haematopus palliatus x bachmaniLast observed by Dan Jehl on 18 Apr 2024
- Great Knot x Surfbird (hybrid) Calidris tenuirostris x virgataLast observed by Matthew Grube on 14 Jul 2012
- Herring x Glaucous Gull (hybrid) Larus argentatus x hyperboreusLast observed by Noah Arthur on 15 Mar 2024
- Western x Glaucous-winged Gull (hybrid) Larus occidentalis x glaucescensLast observed by jeff allen on 20 Apr 2024
- Herring x Glaucous-winged Gull (hybrid) Larus argentatus x glaucescensLast observed by Lizzie F on 15 Apr 2024
- Glaucous x Glaucous-winged Gull (hybrid) Larus hyperboreus x glaucescensLast observed by Paul Saraceni on 8 Apr 2024
- Glaucous-winged x Slaty-backed Gull (hybrid) Larus glaucescens x schistisagusLast observed by Blake Matheson on 16 Jan 2018
- 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 Scott Terrill on 16 Nov 2008
- 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 Susan Smith on 3 Aug 2022
- Yellow-crowned x Black-crowned Night Heron (hybrid) Nyctanassa violacea x Nycticorax nycticoraxLast observed by Jon Fisher on 19 May 2021
- Little Blue Heron x Snowy Egret (hybrid) Egretta caerulea x thulaLast observed by Kimball Garrett on 17 Jan 2000
- Glossy x White-faced Ibis (hybrid) Plegadis falcinellus x chihiLast observed by Lucas stephenson on 26 Jul 2023
- Common Black x Red-shouldered Hawk (hybrid) Buteogallus anthracinus x Buteo lineatusLast observed by Rebecca Olsen on 21 Apr 2024
- Red-tailed x Rough-legged Hawk (hybrid) Buteo jamaicensis x lagopusLast observed by John Davis on 31 Dec 2020
- Spotted x Barred Owl (hybrid) Strix occidentalis x variaLast observed by Bradley M. Stovall on 11 Oct 2020
- Yellow-bellied x Red-naped Sapsucker (hybrid) Sphyrapicus varius x nuchalisLast observed by Robert Furrow on 17 Mar 2024
- Yellow-bellied x Red-breasted Sapsucker (hybrid) Sphyrapicus varius x ruberLast observed by Julie Szabo on 4 Mar 2023
- Red-naped x Red-breasted Sapsucker (hybrid) Sphyrapicus nuchalis x ruberLast observed by Sara McCall on 22 Apr 2024
- Yellow-bellied/Red-naped x Red-breasted Sapsucker (hybrid) Sphyrapicus varius/nuchalis x ruberLast observed by Peter Schneekloth on 6 Mar 2024
- Downy x Nuttall's Woodpecker (hybrid) Dryobates pubescens x nuttalliiLast observed by Bridget Spencer on 20 Apr 2024
- Nuttall's x Ladder-backed Woodpecker (hybrid) Dryobates nuttallii x scalarisLast observed by Sally Veach on 15 Apr 2024
- Downy x Hairy Woodpecker (hybrid) Dryobates pubescens x villosusLast observed by Kate E Magoon on 25 May 2020
- 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 Jim Tietz on 13 May 2022
- Peregrine x Prairie Falcon (hybrid) Falco peregrinus x mexicanusLast observed by Tim Liguori on 21 Mar 2017
- Fischer's x Yellow-collared Lovebird (hybrid) Agapornis fischeri x personatusLast observed by Joshua Mitchell on 9 Jan 2024
- Red-crowned x Lilac-crowned Parrot (hybrid) Amazona viridigenalis x finschiLast observed by Tom Crabtree on 25 Feb 2024
- Red-crowned x Red-lored Parrot (hybrid) Amazona viridigenalis x autumnalisLast observed by Otto Mayer on 19 Nov 2023
- Black x Say's Phoebe (hybrid) Sayornis nigricans x sayaLast observed by Todd Deininger on 17 Oct 2009
- Western Kingbird x Scissor-tailed Flycatcher (hybrid) Tyrannus verticalis x forficatusLast observed by Larry Cahill on 9 Jul 2017
- Philadelphia x Red-eyed Vireo (hybrid) Vireo philadelphicus x olivaceusLast observed by Matt Brady on 9 Sep 2008
- 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 Paul Fenwick on 12 Jul 2016
- Red-whiskered x Red-vented Bulbul (hybrid) Pycnonotus jocosus x caferLast observed by Steven Kurniawidjaja on 16 Jan 2024
- California x Crissal Thrasher (hybrid) Toxostoma redivivum x crissaleLast observed by Sonja Kramer on 7 Apr 2022
- Western x Mountain Bluebird (hybrid) Sialia mexicana x currucoidesLast observed by Josh McLaughlin on 3 Feb 2023
- 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 Chris Henry on 16 Apr 2024
- 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 Steve Glover on 6 Dec 2008
- Bullock's x Baltimore Oriole (hybrid) Icterus bullockii x galbulaLast observed by Chris Dean on 9 Apr 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
- Golden-winged x Blue-winged Warbler (hybrid) Vermivora chrysoptera x cyanopteraLast observed by Brian Sullivan on 9 Oct 2018
- MacGillivray's Warbler x Common Yellowthroat (hybrid) Geothlypis tolmiei x trichasLast observed by Darren Dowell on 20 Sep 2015
- Common Yellowthroat x Yellow Warbler (hybrid) Geothlypis trichas x Setophaga petechiaLast observed by Don Roberson on 20 Sep 2006
- American Redstart x Yellow Warbler (hybrid) Setophaga ruticilla x petechiaLast observed by Farallon Island on 5 Sep 2020
- Cape May x Yellow-rumped Warbler (hybrid) Setophaga tigrina x coronataLast observed by Chuck Schussman on 23 Apr 2018
- Magnolia x Yellow-rumped Warbler (hybrid) Setophaga magnolia x coronataLast observed by Brian Daniels on 16 Mar 2024
- Yellow-rumped x Grace's Warbler (hybrid) Setophaga coronata x graciaeLast observed by Gary Nunn on 5 Apr 2020
- Yellow-rumped x Black-throated Gray Warbler (hybrid) Setophaga coronata x nigrescensLast observed by Justin Bosler on 18 Apr 2010
- Yellow-rumped x Townsend's Warbler (hybrid) Setophaga coronata x townsendiLast observed by Doug Lithgow on 30 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 Paul Lehman on 10 Mar 2024
- Townsend's x Black-throated Green Warbler (hybrid) Setophaga townsendi x virensLast observed by Nicole Desnoyers on 19 Sep 2018
- Rose-breasted x Black-headed Grosbeak (hybrid) Pheucticus ludovicianus x melanocephalusLast observed by Alane Gray on 28 Jun 2023
- Lazuli x Indigo Bunting (hybrid) Passerina amoena x cyaneaLast observed by Tristan Yoo on 3 Nov 2023
Additional Taxa (330)
- 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 John osborne on 22 Apr 2024
- Trumpeter/Tundra Swan Cygnus buccinator/columbianusLast observed by Andy Stepniewski on 10 Feb 2024
- White-winged/Stejneger's Scoter Melanitta deglandi/stejnegeriLast observed by Christian Schwarz on 25 Jan 2014
- Common/Barrow's Goldeneye Bucephala clangula/islandicaLast observed by Todd Finlayson on 7 Apr 2024
- California/Gambel's Quail Callipepla californica/gambeliiLast observed by Robert Theriault on 14 Apr 2024
- Ring-necked/Green Pheasant Phasianus colchicus/versicolorLast observed by Noah Goodwin-Bain on 19 Apr 2023
- Western/Clark's Grebe Aechmophorus occidentalis/clarkiiLast observed by Todd Easterla on 22 Apr 2024
- Rock/Band-tailed Pigeon Columba livia/Patagioenas fasciataLast observed by Ryan Winkleman on 11 Sep 2020
- Eurasian/African Collared-Dove Streptopelia decaocto/roseogriseaLast observed by John Fulton on 30 Mar 2024
- Eastern/Mexican Whip-poor-will Antrostomus vociferus/arizonaeLast observed by John King on 27 Sep 2022
- Ruby-throated/Black-chinned Hummingbird Archilochus colubris/alexandriLast observed by Ken Burton on 12 Nov 2023
- moorhen/coot/gallinule sp. Gallinula/Fulica/Porphyrio sp.Last observed by Gary Lillian on 10 Apr 2024
- American/Black Oystercatcher Haematopus palliatus/bachmaniLast observed by Nick Russo on 17 Mar 2024
- American/Pacific Golden-Plover (Lesser Golden-Plover) Pluvialis dominica/fulvaLast observed by Alexandra Lamb on 12 Dec 2023
- Black-bellied Plover/golden-plover sp. Pluvialis sp.Last observed by Clayton Crofton on 18 Apr 2024
- Common Ringed/Semipalmated Plover Charadrius hiaticula/semipalmatusLast observed by David Yee on 27 Sep 2022
- sand-plover sp. Anarhynchus atrifrons/mongolus/leschenaultiiLast observed by Lucas Brug on 30 Jul 2020
- Short-billed/Long-billed Dowitcher Limnodromus griseus/scolopaceusLast observed by Tom Slyker on 22 Apr 2024
- Lesser/Greater Yellowlegs Tringa flavipes/melanoleucaLast observed by Gonzalo Valadez on 22 Apr 2024
- Sharp-tailed/Pectoral Sandpiper Calidris acuminata/melanotosLast observed by Sam Phillips on 5 Nov 2023
- large shorebird sp. Scolopacidae sp. (large shorebird sp.)Last observed by Aidan Sinha on 21 Apr 2024
- Long-tailed/Parasitic Jaeger Stercorarius longicaudus/parasiticusLast observed by Naresh Satyan on 8 Oct 2023
- Parasitic/Pomarine Jaeger Stercorarius parasiticus/pomarinusLast observed by Paul Mulholland on 22 Apr 2024
- Scripps's/Guadalupe Murrelet (Xantus's Murrelet) Synthliboramphus scrippsi/hypoleucusLast observed by Brandi Crane on 2 Apr 2024
- Scripps's/Craveri's Murrelet Synthliboramphus scrippsi/craveriLast observed by Tracey B on 27 Dec 2023
- 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 Keith Slauson on 8 Dec 2019
- Laughing/Franklin's Gull Leucophaeus atricilla/pipixcanLast observed by Max Benningfield on 31 Oct 2020
- 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 Noah Arthur on 16 Dec 2023
- Herring/Glaucous-winged Gull Larus argentatus/glaucescensLast observed by Naresh Satyan on 29 Feb 2024
- Western/Glaucous-winged Gull Larus occidentalis/glaucescensLast observed by Aidan Brubaker on 21 Apr 2024
- Snowy/Tristan/Antipodean Albatross Diomedea exulans/dabbenena/antipodensisLast observed by CBRC Review Species on 12 Jul 1967
- 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
- storm-petrel sp. (dark-rumped) Oceanitidae/Hydrobatidae sp. (dark-rumped)Last observed by Dave Ebbitt on 13 Feb 2024
- storm-petrel sp. (white-rumped) Oceanitidae/Hydrobatidae sp. (white-rumped)Last observed by Pema Zonglo on 22 Aug 2023
- Galapagos/Hawaiian Petrel (Dark-rumped Petrel) Pterodroma phaeopygia/sandwichensisLast observed by Curtis Marantz on 4 May 2018
- black-and-white shearwater sp. Puffinus sp. (black-and-white shearwater sp.)Last observed by JD Paes on 14 Apr 2024
- Great/Double-crested Cormorant Phalacrocorax carbo/Nannopterum auritumLast observed by Jennifer Lewi on 9 Apr 2023
- Double-crested/Neotropic Cormorant Nannopterum auritum/brasilianumLast observed by Cameron Tescher on 14 Apr 2024
- Yellow-crowned/Black-crowned Night Heron Nycticorax nycticorax/Nyctanassa violaceaLast observed by Brendan Duggan on 20 Apr 2024
- Sharp-shinned/Cooper's Hawk Accipiter striatus/cooperiiLast observed by James Castle Gaither Jr on 21 Apr 2024
- Cooper's Hawk/American Goshawk Accipiter cooperii/atricapillusLast observed by Alan Wight on 20 Jul 2022
- Golden/Bald Eagle Aquila chrysaetos/Haliaeetus leucocephalusLast observed by Rudyard Wallen on 9 Apr 2024
- pygmy-owl/saw-whet owl sp. Glaucidium/Aegolius sp. (pygmy-owl/saw-whet owl sp.)Last observed by Dominik Mosur on 30 Apr 2023
- Yellow-bellied/Red-naped Sapsucker Sphyrapicus varius/nuchalisLast observed by Katie Ng on 8 Mar 2024
- Red-naped/Red-breasted Sapsucker Sphyrapicus nuchalis/ruberLast observed by Kathleen Waldron on 14 Jan 2024
- Downy/Ladder-backed Woodpecker Dryobates pubescens/scalarisLast observed by Konshau Duman on 3 May 2021
- Nuttall's/Ladder-backed Woodpecker Dryobates nuttallii/scalarisLast observed by Ken Corey on 21 Apr 2024
- diurnal raptor sp. Accipitriformes/Falconiformes sp.Last observed by Sally Picciotto on 21 Apr 2024
- 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 Mark Harris on 24 Feb 2024
- Red-crowned/Lilac-crowned Parrot Amazona viridigenalis/finschiLast observed by Chris Dean on 20 Apr 2024
- Mitred/Red-masked Parakeet Psittacara mitratus/erythrogenysLast observed by David Campbell on 17 Apr 2024
- large parakeet sp. (former Aratinga sp.) Eupsittula/Aratinga/Thectocercus/Psittacara sp.Last observed by Emilia Deino on 30 Mar 2024
- Alder/Willow Flycatcher (Traill's Flycatcher) Empidonax alnorum/trailliiLast observed by Stella Solasz on 12 Jun 2023
- Hammond's/Dusky Flycatcher Empidonax hammondii/oberholseriLast observed by Peter Gaede on 21 Apr 2024
- Gray/Dusky Flycatcher Empidonax wrightii/oberholseriLast observed by Kathryn McGiffen on 24 Sep 2023
- Cassin's/Western Kingbird Tyrannus vociferans/verticalisLast observed by Beverly Reynolds on 21 Apr 2024
- yellow-bellied kingbird sp. Tyrannus sp. (yellow-bellied)Last observed by Toby Fowler on 21 Apr 2024
- Philadelphia/Red-eyed Vireo Vireo philadelphicus/olivaceusLast observed by Virginia Chomat on 10 Jun 2023
- Red-eyed/Yellow-green Vireo Vireo olivaceus/flavoviridisLast observed by Mark Stephenson on 29 Sep 2020
- vireo sp. (Red-eyed Vireo complex) Vireo sp. (Red-eyed Vireo complex)Last observed by Nico Schnack on 4 Sep 2020
- Loggerhead/Northern Shrike Lanius ludovicianus/borealisLast observed by Sasha Cahill on 10 Feb 2024
- California/Woodhouse's Scrub-Jay Aphelocoma californica/woodhouseiiLast observed by Luke Thomas on 6 Apr 2024
- Oak/Juniper Titmouse (Plain Titmouse) Baeolophus inornatus/ridgwayiLast observed by Crystal Leslie on 8 Apr 2024
- Red-whiskered/Red-vented Bulbul Pycnonotus jocosus/caferLast observed by Steven Kurniawidjaja on 10 Apr 2024
- Arctic/Kamchatka Leaf Warbler Phylloscopus borealis/examinandusLast observed by Amin Khalifa on 20 Sep 2020
- Ruby-crowned/Golden-crowned Kinglet Corthylio calendula/Regulus satrapaLast observed by Mark Dadds on 16 Mar 2024
- Curve-billed/Bendire's Thrasher Toxostoma curvirostre/bendireiLast observed by Kimball Garrett on 21 Jan 2011
- Varied Thrush/American Robin Ixoreus naevius/Turdus migratoriusLast observed by Ethan Monk on 8 Nov 2023
- Siberian/Amur Stonechat Saxicola maurus/stejnegeriLast observed by San Clemente Island Historic Records on 21 Oct 1995
- Bohemian/Cedar Waxwing Bombycilla garrulus/cedrorumLast observed by Orangevale Birding Club on 27 Nov 2020
- Spizella sp./American Tree Sparrow Spizella/Spizelloides sp.Last observed by Peter Colasanti on 3 Mar 2016
- White-crowned/White-throated Sparrow Zonotrichia leucophrys/albicollisLast observed by Eddie Tache on 8 Dec 2018
- Sagebrush/Bell's Sparrow (Sage Sparrow) Artemisiospiza nevadensis/belliLast observed by Josh McLaughlin on 6 Apr 2024
- Lincoln's/Swamp Sparrow Melospiza lincolnii/georgianaLast observed by Connor Cochrane on 3 Nov 2023
- Spotted/Eastern Towhee (Rufous-sided Towhee) Pipilo maculatus/erythrophthalmusLast observed by Lucas Brug on 23 Oct 2022
- Red-winged/Tricolored Blackbird Agelaius phoeniceus/tricolorLast observed by Ken Ward on 21 Apr 2024
- Bronzed/Brown-headed Cowbird Molothrus aeneus/aterLast observed by Brennan Mulrooney on 15 Sep 2023
- Rusty/Brewer's Blackbird Euphagus carolinus/cyanocephalusLast observed by Lin 'Caspian' Stern on 26 Nov 2023
- Louisiana/Northern Waterthrush Parkesia motacilla/noveboracensisLast observed by Pair of Wing-Nuts on 20 Sep 2023
- Golden-winged/Blue-winged Warbler Vermivora chrysoptera/cyanopteraLast observed by Nick Thorpe on 3 Jun 2023
- Connecticut/MacGillivray's/Mourning Warbler Oporornis/Geothlypis sp. (Mourning-type)Last observed by Alex Merritt on 10 Sep 2017
- MacGillivray's/Mourning Warbler Geothlypis tolmiei/philadelphiaLast observed by Aidan Brubaker on 27 May 2023
- Bay-breasted/Blackpoll Warbler Setophaga castanea/striataLast observed by Aidan Brubaker on 22 Sep 2022
- Black-throated Gray/Townsend's Warbler Setophaga nigrescens/townsendiLast observed by Rajan Rao on 30 Sep 2023
- Black-throated Gray/Hermit Warbler Setophaga nigrescens/occidentalisLast observed by David Fickel on 18 Apr 2024
- Black-throated Gray/Townsend's/Hermit Warbler Setophaga nigrescens/townsendi/occidentalisLast observed by Rajan Rao on 3 Sep 2021
- Townsend's/Hermit Warbler Setophaga townsendi/occidentalisLast observed by Bill McIver on 20 Apr 2024
- Rose-breasted/Black-headed Grosbeak Pheucticus ludovicianus/melanocephalusLast observed by Will Black on 9 Jan 2024