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Snow x Ross's Goose (hybrid)
Graylag x Swan Goose (hybrid)
Swan Goose x Canada Goose (hybrid)
Graylag x Canada Goose (hybrid)
Domestic goose sp. x Canada Goose (hybrid)
Snow x Canada Goose (hybrid)
Blue-winged x Cinnamon Teal (hybrid)
Gadwall x American Wigeon (hybrid)
Wood Duck x Mallard (hybrid)
Gadwall x Mallard (hybrid)
American Wigeon x Mallard (hybrid)
Mallard x American Black Duck (hybrid)
Mallard x Northern Pintail (hybrid)
Redhead x Lesser Scaup (hybrid)
Bufflehead x Common Goldeneye (hybrid)
Common Goldeneye x Hooded Merganser (hybrid)
Laughing x Ring-billed Gull (hybrid)
Kelp x Herring Gull (hybrid)
Herring x Great Black-backed Gull (hybrid)
Herring x Glaucous Gull (hybrid)
Herring x California Gull (hybrid)
Little Blue Heron x Snowy Egret (hybrid)
Dark-eyed Junco x White-throated Sparrow (hybrid)
Spotted x Eastern Towhee (hybrid)
Golden-winged x Blue-winged Warbler (hybrid)
Brewster's Warbler (hybrid)
Lawrence's Warbler (hybrid)
Townsend's x Black-throated Green Warbler (hybrid)
Snow/Ross's Goose
Domestic goose sp. (Domestic type)
Cackling/Canada Goose
Trumpeter/Tundra Swan
Mallard/American Black Duck
Common/Barrow's Goldeneye
Common/Red-breasted Merganser
waterfowl sp.
Ring-necked/Green Pheasant
old world quail sp.
Columba sp.
Eurasian/African Collared-Dove
Streptopelia sp.
Yellow-billed/Black-billed Cuckoo
cuckoo sp. (Cuculidae sp.)
nightjar sp.
Chaetura sp.
Ruby-throated/Black-chinned Hummingbird
Rufous/Allen's Hummingbird
Selasphorus sp.
large rail sp.
moorhen/coot/gallinule sp.
rail/crake sp.
Black-bellied Plover/golden-plover sp.
small plover sp.
Hudsonian/Marbled Godwit
Short-billed/Long-billed Dowitcher
Red/Red-necked Phalarope
phalarope sp.
Lesser/Greater Yellowlegs
Western/Semipalmated Sandpiper
Calidris sp.
Scolopacidae sp.
large shorebird sp.
shorebird sp.
Long-tailed/Parasitic Jaeger
Parasitic/Pomarine Jaeger
Laughing/Franklin's Gull
large tern sp.
gull/tern sp.
Double-crested/Neotropic Cormorant
cormorant sp.
Yellow-crowned/Black-crowned Night Heron
white egret sp.
Glossy/White-faced Ibis
Sharp-shinned/Cooper's Hawk
Cooper's Hawk/American Goshawk
Golden/Bald Eagle
Red-shouldered/Broad-winged Hawk
Long-eared/Short-eared Owl
large falcon sp.
small falcon sp.
Psittacula sp.
parakeet sp.
parrot sp.
Western/Eastern Wood-Pewee
pewee sp. (Contopus sp.)
Alder/Willow Flycatcher (Traill's Flycatcher)
Myiarchus sp.
Tyrannus sp.
Cassin's/Blue-headed Vireo
Philadelphia/Warbling Vireo
Philadelphia/Red-eyed Vireo
Red-eyed/Yellow-green Vireo
Loggerhead/Northern Shrike
chickadee sp.
Cliff/Cave Swallow
Ruby-crowned/Golden-crowned Kinglet
nuthatch sp.
Pacific/Winter Wren
Sedge/Marsh Wren
Catharus sp.
Bohemian/Cedar Waxwing
Euplectes sp.
House/Eurasian Tree Sparrow
crossbill sp.
Serinus sp.
Acanthis/Spinus sp.
Spizella sp./American Tree Sparrow
Zonotrichia sp.
LeConte's/Nelson's Sparrow
Nelson's/Saltmarsh Sparrow (Sharp-tailed Sparrow)
Ammospiza sp.
Grasshopper/Henslow's Sparrow
Spotted/Eastern Towhee (Rufous-sided Towhee)
new world sparrow sp.
Western/Eastern Meadowlark
Bullock's/Baltimore Oriole
new world oriole sp.
Rusty/Brewer's Blackbird
blackbird sp.
Louisiana/Northern Waterthrush
Golden-winged/Blue-winged Warbler
Leiothlypis sp.
Connecticut/MacGillivray's/Mourning Warbler
MacGillivray's/Mourning Warbler
Bay-breasted/Blackpoll Warbler
new world warbler sp.
Summer/Scarlet Tanager
tanager sp. (Piranga sp.)
Pheucticus sp.
Lazuli/Indigo Bunting
Passerina sp.