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Mallard x American Black Duck (hybrid)
Downy x Hairy Woodpecker (hybrid)
Domestic goose sp. x Canada Goose (hybrid)
Swan Goose x Canada Goose (hybrid)
Snow Goose x Brant (hybrid)
American Wigeon x Mallard (hybrid)
Herring x Glaucous Gull (hybrid)
Red-shouldered x Red-tailed Hawk (hybrid)
Herring x Lesser Black-backed Gull (hybrid)
Graylag x Swan Goose (hybrid)
Graylag x Canada Goose (hybrid)
Muscovy Duck x Mallard (hybrid)
Common x Barrow's Goldeneye (hybrid)
Mallard x Northern Pintail (hybrid)
Tufted Duck x Lesser Scaup (hybrid)
Tufted Duck x scaup sp. (hybrid)
Lawrence's Warbler (hybrid)
Brewster's Warbler (hybrid)
Golden-winged x Blue-winged Warbler (hybrid)
Bay-breasted x Blackpoll Warbler (hybrid)
Glossy x White-faced Ibis (hybrid)
Common Goldeneye x Hooded Merganser (hybrid)
Herring x Great Black-backed Gull (hybrid)
Tufted Duck x Greater Scaup (hybrid)
Eurasian x American Wigeon (hybrid)
Snow x Canada Goose (hybrid)
Greater White-fronted x Canada Goose (hybrid)
Mourning Warbler x Common Yellowthroat (hybrid)
Spotted x Eastern Towhee (hybrid)
Bufflehead x Common Goldeneye (hybrid)
Barnacle x Cackling Goose (hybrid)
Barnacle x Canada Goose (hybrid)
Common x Arctic Tern (hybrid)
Magnolia x Yellow-rumped Warbler (hybrid)
American Wigeon x American Black Duck (hybrid)
Gadwall x Mallard (hybrid)
Wood Duck x Mallard (hybrid)
Gadwall x Green-winged Teal (hybrid)
Great Black-backed x Glaucous Gull (hybrid)
Tricolored Heron x Snowy Egret (hybrid)
Snow x Ross's Goose (hybrid)
Mallard x Redhead (hybrid)
Gadwall x American Wigeon (hybrid)
Wood Duck x Hooded Merganser (hybrid)
Dunlin x White-rumped Sandpiper (hybrid)
Black-headed x Ring-billed Gull (hybrid)
Blue-winged x Prairie Warbler (hybrid)
Gadwall x Northern Pintail (hybrid)
Common x Roseate Tern (hybrid)
Curlew x Pectoral Sandpiper (hybrid)
Cinnamon x Green-winged Teal (hybrid)
blackbird sp.
shorebird sp.
cormorant sp.
Mallard/American Black Duck
Common/Red-breasted Merganser
Accipiter sp.
Sharp-shinned/Cooper's Hawk
large alcid sp.
woodpecker sp.
Domestic goose sp. (Domestic type)
Great/Double-crested Cormorant
Thick-billed/Common Murre
swan sp.
white-winged gull sp.
diurnal raptor sp.
new world vulture sp.
dabbling duck sp.
Cackling/Canada Goose
Long-eared/Short-eared Owl
new world warbler sp.
large shorebird sp.
Common/Barrow's Goldeneye
Spizella sp./American Tree Sparrow
Ruby-crowned/Golden-crowned Kinglet
Catharus sp.
crossbill sp.
Spizella sp.
grebe sp.
Western/Semipalmated Sandpiper
Parasitic/Pomarine Jaeger
Lesser/Greater Yellowlegs
Nelson's/Saltmarsh Sparrow (Sharp-tailed Sparrow)
shearwater sp.
Short-billed/Long-billed Dowitcher
black-and-white shearwater sp.
rail/crake sp.
Red/Red-necked Phalarope
Cory's/Great Shearwater
hummingbird sp.
Black-bellied Plover/golden-plover sp.
merganser sp.
Long-tailed/Parasitic Jaeger
Yellow-crowned/Black-crowned Night Heron
Setophaga sp.
Bay-breasted/Blackpoll Warbler
Empidonax sp.
Yellow-billed/Black-billed Cuckoo
Leiothlypis sp.
Gray-cheeked/Bicknell's Thrush
phalarope sp.
Philadelphia/Warbling Vireo
storm-petrel sp.
Calidris sp.
Alder/Willow Flycatcher (Traill's Flycatcher)
Philadelphia/Red-eyed Vireo
Ammospiza sp.
Rufous/Allen's Hummingbird
small falcon sp.
Hudsonian/Marbled Godwit
vireo sp. (Red-eyed Vireo complex)
large tern sp.
white egret sp.
American/Fish Crow
new world oriole sp.
gull/tern sp.
Louisiana/Northern Waterthrush
Common/Arctic Tern
King/Clapper Rail
Golden-winged/Blue-winged Warbler
old world quail sp.
Red-shouldered/Broad-winged Hawk
Hydrobates sp.
Cliff/Cave Swallow
Glossy/White-faced Ibis
parrot sp.
harrier sp.
crow/raven sp.
Eurasian/American Wigeon
longspur sp.
Bohemian/Cedar Waxwing
waterfowl sp.
Western/Eastern Meadowlark
Ring-necked/Green Pheasant
sulid sp.
Lincoln's/Swamp Sparrow
pigeon/dove sp.
Passerina sp.
Myiarchus sp.
Golden/Bald Eagle
procellariid sp.
large falcon sp.
large rail sp.
storm-petrel sp. (white-rumped)
yellow-bellied kingbird sp.
nuthatch sp.
Horned/Eared Grebe
Cooper's Hawk/American Goshawk
solitary vireo sp.
Western/Eastern Wood-Pewee
Double-crested/Neotropic Cormorant
Cory's/Cape Verde Shearwater
Ruby-throated/Black-chinned Hummingbird
American/Pacific Golden-Plover (Lesser Golden-Plover)
sparrow/warbler sp. (trilling song)
pewee sp. (Contopus sp.)
Summer/Scarlet Tanager
Caprimulgus sp.
Common/Hoary Redpoll
Herring/Iceland Gull
new world quail sp.
eider sp.
Anser sp.
Bullock's/Baltimore Oriole
new world goldfinch sp.
Herring/Lesser Black-backed Gull
Ardea sp.
jaeger/skua sp.
Connecticut/MacGillivray's/Mourning Warbler
MacGillivray's/Mourning Warbler
tanager sp. (Piranga sp.)
Scolopacidae sp.
new world martin sp. (Progne sp.)
Tropical/Couch's Kingbird
nightjar sp.
small bittern sp.
Common/Short-billed Gull
Podiceps sp.
Sedge/Marsh Wren
Cassin's/Blue-headed Vireo
Common Ringed/Semipalmated Plover
King/Virginia Rail
chickadee sp.
golden-plover sp.
Chimney/Vaux's Swift
Sooty/Short-tailed Shearwater
Rose-breasted/Black-headed Grosbeak
nighthawk sp.
Snow/Ross's Goose
Zonotrichia sp.
moorhen/coot/gallinule sp.
Chaetura sp.
King/Common Eider
Lazuli/Indigo Bunting
Selasphorus sp.
Coccyzus sp.
Antrostomus sp.
Melanerpes sp.
Dryobates sp.
Arctic/Pacific Loon
parakeet sp.
Haemorhous sp.
Passer sp.
large swift sp.
albatross sp.
Loggerhead/Northern Shrike
Petrochelidon sp.
frigatebird sp.
small albatross sp.
Boat-tailed/Great-tailed Grackle
Red-necked/Little Stint
Cathartes sp.
Streaked/Sulphur-bellied Flycatcher
cuckoo sp. (Cuculidae sp.)