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Mallard x American Black Duck (hybrid)
Snow x Canada Goose (hybrid)
Common x Barrow's Goldeneye (hybrid)
Herring x Lesser Black-backed Gull (hybrid)
Herring x Great Black-backed Gull (hybrid)
Greater White-fronted x Canada Goose (hybrid)
Herring x Glaucous Gull (hybrid)
Mallard x Northern Pintail (hybrid)
Red-shouldered x Red-tailed Hawk (hybrid)
Snow x Ross's Goose (hybrid)
Snow x Greater White-fronted Goose (hybrid)
Common Goldeneye x Hooded Merganser (hybrid)
Ring-necked Duck x scaup sp. (hybrid)
White-crowned x White-throated Sparrow (hybrid)
Eurasian x American Wigeon (hybrid)
Golden-winged x Blue-winged Warbler (hybrid)
Brewster's Warbler (hybrid)
Mourning Warbler x Common Yellowthroat (hybrid)
Chipping x Clay-colored Sparrow (hybrid)
Gadwall x Mallard (hybrid)
Bay-breasted x Blackburnian Warbler (hybrid)
Ring-necked Duck x Lesser Scaup (hybrid)
King x Common Eider (hybrid)
Bufflehead x Common Goldeneye (hybrid)
Dark-eyed Junco x White-throated Sparrow (hybrid)
Barnacle x Canada Goose (hybrid)
Ring-necked Duck x Greater Scaup (hybrid)
Tufted Duck x Greater Scaup (hybrid)
Tufted Duck x scaup sp. (hybrid)
Great Black-backed x Glaucous Gull (hybrid)
Graylag x Swan Goose (hybrid)
Domestic goose sp. x Canada Goose (hybrid)
Glossy x White-faced Ibis (hybrid)
Blue-winged x Green-winged Teal (hybrid)
Wood Duck x Mallard (hybrid)
Lapland Longspur x Snow Bunting (hybrid)
American Wigeon x Mallard (hybrid)
Lawrence's Warbler (hybrid)
Song x Lincoln's Sparrow (hybrid)
Graylag x Canada Goose (hybrid)
Chipping x Field Sparrow (hybrid)
Clay-colored x Field Sparrow (hybrid)
Muscovy Duck x Mallard (hybrid)
Bufflehead x Hooded Merganser (hybrid)
Pine Siskin x American Goldfinch (hybrid)
Swan Goose x Canada Goose (hybrid)
Gadwall x Northern Pintail (hybrid)
Blue-winged Teal x Northern Shoveler (hybrid)
Sandhill x Common Crane (hybrid)
Palm x Yellow-rumped Warbler (hybrid)
Blue-winged x Cinnamon Teal (hybrid)
Common/Barrow's Goldeneye
Greater/Lesser Scaup
small falcon sp.
diurnal raptor sp.
cormorant sp.
shorebird sp.
Domestic goose sp. (Domestic type)
Sharp-shinned/Cooper's Hawk
House/Purple Finch
Cooper's Hawk/American Goshawk
Golden/Bald Eagle
Common/Red-breasted Merganser
Cackling/Canada Goose
Mallard/American Black Duck
American/Fish Crow
Surf/Black Scoter
ptarmigan sp.
crossbill sp.
crow sp.
nuthatch sp.
Great/Double-crested Cormorant
Catharus sp.
pigeon/dove sp.
Ruffed/Spruce Grouse
goose sp.
King/Common Eider
Buteo/eagle sp.
Tyrannus sp.
new world warbler sp.
Long-eared/Short-eared Owl
Calidris sp.
Thick-billed/Common Murre
large falcon sp.
jaeger/skua sp.
Western/Eastern Cattle Egret
Ruby-crowned/Golden-crowned Kinglet
Snow/Ross's Goose
procellariid sp.
Parasitic/Pomarine Jaeger
Lesser/Greater Yellowlegs
phalarope sp.
Trumpeter/Tundra Swan
Red/Red-necked Phalarope
Black-bellied Plover/golden-plover sp.
storm-petrel sp.
storm-petrel sp. (white-rumped)
Short-billed/Long-billed Dowitcher
Podiceps sp.
Common/Arctic Tern
new world flycatcher sp.
Yellow-billed/Black-billed Cuckoo
Eurasian/American Wigeon
Gray-cheeked/Bicknell's Thrush
Red-shouldered/Broad-winged Hawk
Lincoln's/Swamp Sparrow
pygmy-owl/saw-whet owl sp.
Empidonax sp.
Bay-breasted/Blackpoll Warbler
Philadelphia/Red-eyed Vireo
Alder/Willow Flycatcher (Traill's Flycatcher)
Spizella sp.
shearwater sp.
rail/crake sp.
Leiothlypis sp.
Cathartes sp.
Philadelphia/Warbling Vireo
Long-tailed/Parasitic Jaeger
new world oriole sp.
Oceanites sp.
Procellaria sp.
black-and-white shearwater sp.
Sturnella meadowlark sp.
Hen/Northern Harrier
Golden-winged/Blue-winged Warbler
Loggerhead/Northern Shrike
Rusty/Brewer's Blackbird
nightjar sp.
American Three-toed/Black-backed Woodpecker
Passer sp.
waterfowl sp.
pewee sp. (Contopus sp.)
Spotted/Eastern Towhee (Rufous-sided Towhee)
Louisiana/Northern Waterthrush
Myiarchus sp.
Western/Eastern Meadowlark
chickadee sp.
Passerina sp.
Coccyzus sp.
Taiga/Tundra Bean-Goose
small swift sp.
Forster's/Common Tern
Glossy/White-faced Ibis
Chlidonias sp.
Western/Semipalmated Sandpiper
large shorebird sp.
LeConte's/Nelson's Sparrow
new world vulture sp.
godwit sp.
Cassin's/Blue-headed Vireo
hummingbird sp.
vireo sp. (Red-eyed Vireo complex)
Horned/Eared Grebe
Western/Eastern Wood-Pewee
Eurasian/African Collared-Dove
white egret sp.
lovebird sp.
Ammospiza sp.
old world quail sp.
Sedge/Marsh Wren
cuckoo sp. (Cuculidae sp.)
Velvet/White-winged/Stejneger's Scoter
Great/Medium Egret
Common/Short-billed Gull
Rose-breasted/Black-headed Grosbeak
Cory's/Great Shearwater
Yellow-crowned/Black-crowned Night Heron
large tern sp.
Laughing/Franklin's Gull
Mallard/Mexican Duck
Cliff/Cave Swallow
Spizella sp./American Tree Sparrow
Red-eyed/Yellow-green Vireo
White-crowned/White-throated Sparrow
new world goldfinch sp.
small plover sp.
moorhen/coot/gallinule sp.
Haemorhous sp.
Brown/Long-billed Thrasher
Arctic/Pacific Loon
tanager sp. (Piranga sp.)
large swift sp.
Chimney/Vaux's Swift
Western/Clark's Grebe
Bullock's/Black-backed Oriole
Setophaga sp.
Serinus sp.
Common/Wilson's Snipe
Ring-necked/Green Pheasant
Streptopelia sp.
frigatebird sp.
Common Ringed/Semipalmated Plover
Bullock's/Baltimore Oriole
parakeet sp.