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Mallard x American Black Duck (hybrid)
Domestic goose sp. x Canada Goose (hybrid)
Graylag x Canada Goose (hybrid)
Muscovy Duck x Mallard (hybrid)
Swan Goose x Canada Goose (hybrid)
Redhead x Ring-necked Duck (hybrid)
Snow Goose x Brant (hybrid)
Common x Barrow's Goldeneye (hybrid)
Red-shouldered x Red-tailed Hawk (hybrid)
Eurasian x American Wigeon (hybrid)
Snow x Canada Goose (hybrid)
Herring x Glaucous Gull (hybrid)
Mallard x Northern Pintail (hybrid)
Snow x Ross's Goose (hybrid)
Redhead x scaup sp. (hybrid)
Herring x Lesser Black-backed Gull (hybrid)
Graylag x Swan Goose (hybrid)
Greater White-fronted x Canada Goose (hybrid)
Common Goldeneye x Hooded Merganser (hybrid)
Ring-necked Duck x Greater Scaup (hybrid)
Canvasback x Redhead (hybrid)
Herring x Great Black-backed Gull (hybrid)
Ring-necked Duck x scaup sp. (hybrid)
Tufted Duck x scaup sp. (hybrid)
Black-headed x Ring-billed Gull (hybrid)
Barnacle x Cackling Goose (hybrid)
Golden-winged x Blue-winged Warbler (hybrid)
Brewster's Warbler (hybrid)
Lawrence's Warbler (hybrid)
King x Clapper Rail (hybrid)
Barn x Cliff Swallow (hybrid)
Wood Duck x Mallard (hybrid)
Dark-eyed Junco x White-throated Sparrow (hybrid)
Trumpeter x Tundra Swan (hybrid)
Snow x Cackling Goose (hybrid)
Redhead x Lesser Scaup (hybrid)
Ring-necked Duck x Lesser Scaup (hybrid)
Gadwall x Mallard (hybrid)
Greater White-fronted x Cackling Goose (hybrid)
Great Black-backed x Glaucous Gull (hybrid)
Dunlin x White-rumped Sandpiper (hybrid)
Clay-colored x Field Sparrow (hybrid)
Yellow-throated x Blue-headed Vireo (hybrid)
Spotted x Eastern Towhee (hybrid)
Blue-winged Teal x Northern Shoveler (hybrid)
Canvasback x scaup sp. (hybrid)
Barnacle x Canada Goose (hybrid)
Blue-winged x Green-winged Teal (hybrid)
Gadwall x American Wigeon (hybrid)
Chipping x Clay-colored Sparrow (hybrid)
Blue-winged x Cinnamon Teal (hybrid)
American Wigeon x Mallard (hybrid)
Pine Siskin x American Goldfinch (hybrid)
Gadwall x Northern Pintail (hybrid)
Northern Pintail x Green-winged Teal (hybrid)
Yellow-bellied x Red-naped Sapsucker (hybrid)
Surf x White-winged Scoter (hybrid)
Nelson's x Saltmarsh Sparrow (hybrid)
Northern Shoveler x Mallard (hybrid)
goldeneye sp. x Hooded Merganser (hybrid)
Western x Eastern Kingbird (hybrid)
Brant x Cackling Goose (hybrid)
Mourning Warbler x Common Yellowthroat (hybrid)
Couch's Kingbird x Scissor-tailed Flycatcher (hybrid)
Townsend's x Hermit Warbler (hybrid)
Louisiana/Northern Waterthrush
Common/Red-breasted Merganser
Sharp-shinned/Cooper's Hawk
diurnal raptor sp.
passerine sp.
Lesser/Greater Yellowlegs
Mallard/American Black Duck
Domestic goose sp. (Domestic type)
American/Fish Crow
new world warbler sp.
Forster's/Common Tern
Spizella sp./American Tree Sparrow
Ruby-crowned/Golden-crowned Kinglet
dabbling duck sp.
Catharus sp.
waterfowl sp.
sparrow/warbler sp. (trilling song)
Acanthis/Spinus sp.
White-crowned/White-throated Sparrow
Great/Double-crested Cormorant
Trumpeter/Tundra Swan
new world vulture sp.
Zonotrichia sp.
large alcid sp.
chickadee sp.
Short-billed/Long-billed Dowitcher
large falcon sp.
crossbill sp.
rail/crake sp.
Common/Barrow's Goldeneye
Buteo/eagle sp.
Myiarchus sp.
Calidris sp.
Rufous/Allen's Hummingbird
Eurasian/American Wigeon
Nelson's/Saltmarsh Sparrow (Sharp-tailed Sparrow)
Cliff/Cave Swallow
Parasitic/Pomarine Jaeger
Lincoln's/Swamp Sparrow
Glossy/White-faced Ibis
Sooty/Short-tailed Shearwater
Ammospiza sp.
Red/Red-necked Phalarope
hummingbird sp.
yellow-bellied kingbird sp.
Bay-breasted/Blackpoll Warbler
Philadelphia/Warbling Vireo
Lazuli/Indigo Bunting
Yellow-crowned/Black-crowned Night Heron
Yellow-billed/Black-billed Cuckoo
Gray-cheeked/Bicknell's Thrush
Golden-winged/Blue-winged Warbler
phalarope sp.
Pacific/Winter Wren
large shorebird sp.
large tern sp.
Black-bellied Plover/golden-plover sp.
Alder/Willow Flycatcher (Traill's Flycatcher)
Long-tailed/Parasitic Jaeger
Leiothlypis sp.
Western/Semipalmated Sandpiper
yellowthroat sp.
large rail sp.
storm-petrel sp.
pewee sp. (Contopus sp.)
King/Clapper Rail
Connecticut/MacGillivray's/Mourning Warbler
Common/Arctic Tern
black-and-white shearwater sp.
new world oriole sp.
Philadelphia/Red-eyed Vireo
Tropical/Couch's Kingbird
parrot sp.
Cory's/Cape Verde Shearwater
jaeger/skua sp.
Passerina sp.
nightjar sp.
Cooper's Hawk/American Goshawk
Scolopacidae sp.
small plover sp.
Ring-necked/Green Pheasant
Boat-tailed/Great-tailed Grackle
Mallard/Mottled Duck
Western/Eastern Meadowlark
Common/Short-billed Gull
Herring/Iceland Gull
Herring/Lesser Black-backed Gull
Streptopelia sp.
Purple/Cassin's Finch
Selasphorus sp.
American Black/Mottled Duck
Anser sp.
Common/Yellow-billed Loon
Cassin's/Blue-headed Vireo
Western/Eastern Wood-Pewee
cuckoo sp. (Cuculidae sp.)
nighthawk sp.
tanager sp. (Piranga sp.)
Blue-winged/Cinnamon Teal
American/Pacific Golden-Plover (Lesser Golden-Plover)
Dark-eyed Junco/Pine Warbler
Rose-breasted/Black-headed Grosbeak
plover sp.
Double-crested/Neotropic Cormorant
Hydrobates sp.
procellariid sp.
Chipping Sparrow/Worm-eating Warbler
Long-eared/Short-eared Owl
golden-plover sp.
Coccyzus sp.
Tyrannus sp.
Common Ringed/Semipalmated Plover
corella/white cockatoo sp.
new world martin sp. (Progne sp.)
sapsucker sp.
Carolina/Black-capped Chickadee
Spotted/Eastern Towhee (Rufous-sided Towhee)
Common/Black Scoter
redpoll sp.
Yellow-legged/Lesser Black-backed Gull
King/Common Eider
storm-petrel sp. (white-rumped)
Sooty/Bridled Tern
Thalasseus sp.
Common/Wilson's Snipe
Haemorhous sp.
pheasant sp.
Velvet/White-winged/Stejneger's Scoter
Eurasian/African Collared-Dove
small bittern sp.
Pterodroma sp.
Sedge/Marsh Wren
moorhen/coot/gallinule sp.
Laughing/Franklin's Gull
old world quail sp.
Rusty/Brewer's Blackbird
large macaw sp.
American Three-toed/Black-backed Woodpecker
Western/Clark's Grebe
Thick-billed/Common Murre
Brown/Long-billed Thrasher
Hepatic/Summer Tanager
Red-shouldered/Broad-winged Hawk
Petrochelidon sp.
Long-tailed/Pomarine Jaeger
Dryobates sp.
Yellow-bellied/Red-naped Sapsucker
parakeet sp.
lovebird sp.
longspur sp.
small swift sp.
Chimney/Vaux's Swift
tropicbird sp.
Zino's/Fea's Petrel
small albatross sp.
Arctic/Pacific Loon
Euplectes sp.
Red-necked/Little Stint
Loggerhead/Northern Shrike
hornbill sp.
new world quail sp.