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Mallard x American Black Duck (hybrid)
Domestic goose sp. x Canada Goose (hybrid)
Brewster's Warbler (hybrid)
Golden-winged x Blue-winged Warbler (hybrid)
Common x Barrow's Goldeneye (hybrid)
Mallard x Northern Pintail (hybrid)
Nelson's x Saltmarsh Sparrow (hybrid)
Herring x Great Black-backed Gull (hybrid)
Barn x Cave Swallow (hybrid)
Dark-eyed Junco x White-throated Sparrow (hybrid)
Ring-necked Duck x Lesser Scaup (hybrid)
American Wigeon x Mallard (hybrid)
Greater White-fronted x Canada Goose (hybrid)
Snowy x Little Egret (hybrid)
Graylag x Swan Goose (hybrid)
Graylag x Canada Goose (hybrid)
Tufted Duck x scaup sp. (hybrid)
Tricolored Heron x Snowy Egret (hybrid)
Herring x Lesser Black-backed Gull (hybrid)
Herring x Glaucous Gull (hybrid)
Snow x Ross's Goose (hybrid)
Lawrence's Warbler (hybrid)
Muscovy Duck x Mallard (hybrid)
Eurasian x American Wigeon (hybrid)
Accipiter sp.
rail/crake sp.
shorebird sp.
cormorant sp.
passerine sp.
Lesser/Greater Yellowlegs
Common/Red-breasted Merganser
Domestic goose sp. (Domestic type)
Downy/Hairy Woodpecker
Great/Double-crested Cormorant
new world sparrow sp.
Sharp-shinned/Cooper's Hawk
white-winged gull sp.
Mallard/American Black Duck
Cackling/Canada Goose
Common/Barrow's Goldeneye
Thick-billed/Common Murre
Aythya sp.
large alcid sp.
Nelson's/Saltmarsh Sparrow (Sharp-tailed Sparrow)
small falcon sp.
Ruby-crowned/Golden-crowned Kinglet
white egret sp.
Bay-breasted/Blackpoll Warbler
Forster's/Common Tern
large shorebird sp.
Myiarchus sp.
Ammospiza sp.
Catharus sp.
Short-billed/Long-billed Dowitcher
tern sp.
Western/Semipalmated Sandpiper
Alder/Willow Flycatcher (Traill's Flycatcher)
Philadelphia/Warbling Vireo
Yellow-crowned/Black-crowned Night Heron
black-and-white shearwater sp.
gull/tern sp.
Louisiana/Northern Waterthrush
diurnal raptor sp.
new world flycatcher sp.
new world vulture sp.
Yellow-billed/Black-billed Cuckoo
Black-bellied Plover/golden-plover sp.
Gray-cheeked/Bicknell's Thrush
Ring-necked/Green Pheasant
Western/Eastern Wood-Pewee
new world oriole sp.
Tringa sp.
King/Clapper Rail
merganser sp.
Rufous/Allen's Hummingbird
phalarope sp.
Parasitic/Pomarine Jaeger
Sooty/Bridled Tern
Long-tailed/Parasitic Jaeger
Cliff/Cave Swallow
waterfowl sp.
Common/Hoary Redpoll
Common/Oriental Cuckoo
Philadelphia/Red-eyed Vireo
Eurasian/American Wigeon
Velvet/White-winged/Stejneger's Scoter
Acanthis/Spinus sp.
dabbling duck sp.
bluebird sp.
Lazuli/Indigo Bunting
Snow/Ross's Goose
Selasphorus sp.
Buteo/eagle sp.
Hydrobates sp.
crossbill sp.
crow/raven sp.
storm-petrel sp. (white-rumped)
elaenia sp. (genus Elaenia)
Arctic/Pacific Loon