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Washington
Illustrated Checklist
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Native and Naturalized (267)
Exotic: Escapee (8)
Hybrids (4)
- Mallard x American Black Duck (hybrid) Anas platyrhynchos x rubripesLast observed by Allan Strong on 12 Sep 2020
- Herring x Great Black-backed Gull (hybrid) Larus argentatus x marinusLast observed by Spencer Hardy on 2 Jan 2018
- Brewster's Warbler (hybrid) Vermivora chrysoptera x cyanoptera (F1 hybrid)Last observed by Bryan Pfeiffer on 21 Aug 2022
- Lawrence's Warbler (hybrid) Vermivora chrysoptera x cyanoptera (F2 backcross)Last observed by scott sainsbury on 2 May 2011
Additional Taxa (68)
- Mallard/American Black Duck Anas platyrhynchos/rubripesLast observed by Ben Huizenga on 28 Dec 2023
- Common/Red-breasted Merganser Mergus merganser/serratorLast observed by Janet Saylor on 28 Mar 2023
- Lesser/Greater Yellowlegs Tringa flavipes/melanoleucaLast observed by Karen Pettersen on 8 Oct 2021
- Sharp-shinned/Cooper's Hawk Accipiter striatus/cooperiiLast observed by Brent Stephenson on 21 Apr 2024
- Cooper's Hawk/American Goshawk Accipiter cooperii/atricapillusLast observed by Richard Littauer on 16 Apr 2023
- American Three-toed/Black-backed Woodpecker Picoides dorsalis/arcticusLast observed by Richard Littauer on 19 Dec 2020
- diurnal raptor sp. Accipitriformes/Falconiformes sp.Last observed by Richard Littauer on 27 Aug 2023
- Alder/Willow Flycatcher (Traill's Flycatcher) Empidonax alnorum/trailliiLast observed by Rebecca Waterman on 3 Sep 2023
- solitary vireo sp. Vireo cassinii/solitarius/plumbeusLast observed by North Branch Nature Center on 16 Sep 1998
- Philadelphia/Warbling Vireo Vireo philadelphicus/gilvusLast observed by Pamela Hathaway on 29 May 2023
- Philadelphia/Red-eyed Vireo Vireo philadelphicus/olivaceusLast observed by Richard Littauer on 17 Sep 2023
- Ruby-crowned/Golden-crowned Kinglet Corthylio calendula/Regulus satrapaLast observed by Richard Littauer on 24 Oct 2020
- Gray-cheeked/Bicknell's Thrush Catharus minimus/bicknelliLast observed by Richard Littauer on 10 Oct 2023
- Bohemian/Cedar Waxwing Bombycilla garrulus/cedrorumLast observed by Richard Littauer on 21 Feb 2023
- Spizella sp./American Tree Sparrow Spizella/Spizelloides sp.Last observed by Richard Littauer on 2 Dec 2020
- White-crowned/White-throated Sparrow Zonotrichia leucophrys/albicollisLast observed by Richard Littauer on 12 May 2020
- Lincoln's/Swamp Sparrow Melospiza lincolnii/georgianaLast observed by Richard Littauer on 22 Sep 2023
- Louisiana/Northern Waterthrush Parkesia motacilla/noveboracensisLast observed by Chip Darmstadt on 10 Sep 2021
- Golden-winged/Blue-winged Warbler Vermivora chrysoptera/cyanopteraLast observed by Sean Beckett on 16 May 2023
- Bay-breasted/Blackpoll Warbler Setophaga castanea/striataLast observed by Gail Yanowitch on 29 Aug 2023