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Illustrated Checklist
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Native and Naturalized (393)
Exotic: Provisional (2)
Exotic: Escapee (31)
Hybrids (33)
- Greater White-fronted x Cackling Goose (hybrid) Anser albifrons x Branta hutchinsiiLast observed by Andrew Jacobson on 17 Jan 2022
- Swan Goose x Canada Goose (hybrid) Anser cygnoides x Branta canadensisLast observed by Alex Tey on 31 Jul 2020
- Graylag x Canada Goose (hybrid) Anser anser x Branta canadensisLast observed by Brian Pendleton on 20 Jun 2019
- Domestic goose sp. x Canada Goose (hybrid) Anser sp. (Domestic type) x Branta canadensisLast observed by Karen Snepp on 19 Mar 2024
- Snow x Canada Goose (hybrid) Anser caerulescens x Branta canadensisLast observed by Sam Fason on 20 Nov 2021
- Blue-winged x Cinnamon Teal (hybrid) Spatula discors x cyanopteraLast observed by Matt Dalessio on 11 May 2019
- Gadwall x American Wigeon (hybrid) Mareca strepera x americanaLast observed by John Leszczynski on 25 May 2019
- Eurasian x American Wigeon (hybrid) Mareca penelope x americanaLast observed by Seth Kelsey on 20 Apr 2024
- Muscovy Duck x Mallard (hybrid) Cairina moschata x Anas platyrhynchosLast observed by Breck Haining on 9 Mar 2023
- Wood Duck x Mallard (hybrid) Aix sponsa x Anas platyrhynchosLast observed by Hanan Jacoby on 21 Apr 2024
- Gadwall x Mallard (hybrid) Mareca strepera x Anas platyrhynchosLast observed by Grace Oliver on 27 Apr 2012
- American Wigeon x Mallard (hybrid) Mareca americana x Anas platyrhynchosLast observed by Adrian Lee on 6 Feb 2022
- Mallard x American Black Duck (hybrid) Anas platyrhynchos x rubripesLast observed by Ryan Merrill on 7 Jun 2008
- Mallard x Northern Pintail (hybrid) Anas platyrhynchos x acutaLast observed by M. Rogers on 7 Nov 2019
- American Wigeon x Green-winged Teal (hybrid) Mareca americana x Anas creccaLast observed by Louis Kreemer on 11 Apr 2023
- Ring-necked Duck x Greater Scaup (hybrid) Aythya collaris x marilaLast observed by Ryan Merrill on 29 Jan 2022
- Tufted Duck x Greater Scaup (hybrid) Aythya fuligula x marilaLast observed by Tim Shelmerdine on 24 Feb 1991
- Ring-necked Duck x Lesser Scaup (hybrid) Aythya collaris x affinisLast observed by Alexander Sowers on 25 Mar 2021
- Ring-necked Duck x scaup sp. (hybrid) Aythya collaris x marila/affinisLast observed by David Robichaud on 21 Apr 2024
- Tufted Duck x scaup sp. (hybrid) Aythya fuligula x marila/affinisLast observed by Jim Elder on 23 Apr 1988
- Common x Barrow's Goldeneye (hybrid) Bucephala clangula x islandicaLast observed by Akshay Sharma on 6 Jan 2024
- Western x Clark's Grebe (hybrid) Aechmophorus occidentalis x clarkiiLast observed by Raphael Fennimore on 21 May 2022
- Anna's x Rufous Hummingbird (hybrid) Calypte anna x Selasphorus rufusLast observed by Charlie Wright on 11 Apr 2010
- Herring x Glaucous Gull (hybrid) Larus argentatus x hyperboreusLast observed by Alex Meilleur on 4 Feb 2023
- Western x Glaucous-winged Gull (hybrid) Larus occidentalis x glaucescensLast observed by Pam Cahn on 22 Apr 2024
- Herring x Glaucous-winged Gull (hybrid) Larus argentatus x glaucescensLast observed by Zachary Rosenlund on 31 Mar 2024
- Glaucous x Glaucous-winged Gull (hybrid) Larus hyperboreus x glaucescensLast observed by Alec Roseto on 6 Feb 2022
- Red-naped x Red-breasted Sapsucker (hybrid) Sphyrapicus nuchalis x ruberLast observed by Spencer Hildie on 14 Sep 2023
- White-crowned x Golden-crowned Sparrow (hybrid) Zonotrichia leucophrys x atricapillaLast observed by Adrian Lee on 21 Nov 2023
- MacGillivray's Warbler x Common Yellowthroat (hybrid) Geothlypis tolmiei x trichasLast observed by Ryan Merrill on 5 Jul 2010
- Black-throated Gray x Townsend's Warbler (hybrid) Setophaga nigrescens x townsendiLast observed by A Kopitov on 15 Oct 2023
- Townsend's x Hermit Warbler (hybrid) Setophaga townsendi x occidentalisLast observed by John Puschock on 30 Jul 2023
Additional Taxa (151)
- Domestic goose sp. (Domestic type) Anser sp. (Domestic type)Last observed by Daniel Najera on 6 Apr 2024
- Trumpeter/Tundra Swan Cygnus buccinator/columbianusLast observed by Marissa Benavente on 11 Apr 2024
- Common/Red-breasted Merganser Mergus merganser/serratorLast observed by Ryan Merrill on 18 Apr 2024
- Ring-necked/Green Pheasant Phasianus colchicus/versicolorLast observed by Olin Nespor on 8 Sep 2021
- Rock/Band-tailed Pigeon Columba livia/Patagioenas fasciataLast observed by Bill Hubbard on 2 Apr 2024
- Eurasian/African Collared-Dove Streptopelia decaocto/roseogriseaLast observed by Carl Haynie on 25 Sep 2022
- American/Pacific Golden-Plover (Lesser Golden-Plover) Pluvialis dominica/fulvaLast observed by John Puschock on 9 Oct 2020
- Short-billed/Long-billed Dowitcher Limnodromus griseus/scolopaceusLast observed by Raphael Fennimore on 14 Oct 2023
- Red/Red-necked Phalarope Phalaropus fulicarius/lobatusLast observed by Raphael Fennimore on 7 Nov 2023
- Lesser/Greater Yellowlegs Tringa flavipes/melanoleucaLast observed by Bartholomew Birdee on 15 Sep 2023
- Long-tailed/Parasitic Jaeger Stercorarius longicaudus/parasiticusLast observed by Ryan Merrill on 10 Sep 2023
- Parasitic/Pomarine Jaeger Stercorarius parasiticus/pomarinusLast observed by Ryan Merrill on 13 Oct 2023
- Western/Glaucous-winged Gull Larus occidentalis/glaucescensLast observed by Matt Dufort on 22 Apr 2024
- Sooty/Short-tailed Shearwater Ardenna grisea/tenuirostrisLast observed by Dave Slager on 1 Oct 2023
- Sharp-shinned/Cooper's Hawk Accipiter striatus/cooperiiLast observed by Scott Freeman on 21 Apr 2024
- Cooper's Hawk/American Goshawk Accipiter cooperii/atricapillusLast observed by Spencer Hildie on 3 Nov 2023
- Golden/Bald Eagle Aquila chrysaetos/Haliaeetus leucocephalusLast observed by Ryan Merrill on 20 May 2023
- Red-naped/Red-breasted Sapsucker Sphyrapicus nuchalis/ruberLast observed by John Prata on 19 Feb 2024
- American Three-toed/Black-backed Woodpecker Picoides dorsalis/arcticusLast observed by Carl Haynie on 16 Aug 2022
- Downy/Hairy Woodpecker Dryobates pubescens/villosusLast observed by Anonymous eBirder on 13 Apr 2024
- Mitred/Red-masked Parakeet Psittacara mitratus/erythrogenysLast observed by tom aversa on 9 Apr 1998
- large parakeet sp. (former Aratinga sp.) Eupsittula/Aratinga/Thectocercus/Psittacara sp.Last observed by Charlie Wright on 26 Apr 2008
- Alder/Willow Flycatcher (Traill's Flycatcher) Empidonax alnorum/trailliiLast observed by Pat Ballard on 17 Aug 1960
- Hammond's/Dusky Flycatcher Empidonax hammondii/oberholseriLast observed by Anonymous eBirder on 3 Aug 2022
- Gray/Dusky Flycatcher Empidonax wrightii/oberholseriLast observed by Raphael Fennimore on 8 May 2022
- Loggerhead/Northern Shrike Lanius ludovicianus/borealisLast observed by Marymoor Survey on 14 Mar 2024
- Tree/Violet-green Swallow Tachycineta bicolor/thalassinaLast observed by Raphael Fennimore on 22 Apr 2024
- Ruby-crowned/Golden-crowned Kinglet Corthylio calendula/Regulus satrapaLast observed by Anonymous eBirder on 22 Apr 2024
- Varied Thrush/American Robin Ixoreus naevius/Turdus migratoriusLast observed by Robert Norheim on 17 Apr 2024
- Spotted/Eastern Towhee (Rufous-sided Towhee) Pipilo maculatus/erythrophthalmusLast observed by Michelle Simon on 25 May 2020
- Black-throated Gray/Townsend's Warbler Setophaga nigrescens/townsendiLast observed by Dave Slager on 21 Sep 2023
- Townsend's/Hermit Warbler Setophaga townsendi/occidentalisLast observed by Ben Roberts on 29 Jun 2023
- Rose-breasted/Black-headed Grosbeak Pheucticus ludovicianus/melanocephalusLast observed by Alexander Sowers on 1 Jun 2022