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Western x Glaucous-winged Gull (hybrid)
Mallard x Mottled Duck (hybrid)
Mallard x Hawaiian Duck (hybrid)
Tufted x Black-crested Titmouse (hybrid)
Graylag x Swan Goose (hybrid)
Herring x Glaucous-winged Gull (hybrid)
Carolina x Black-capped Chickadee (hybrid)
Mallard x American Black Duck (hybrid)
Domestic goose sp. x Canada Goose (hybrid)
Muscovy Duck x Mallard (hybrid)
Mallard x Mexican Duck (hybrid)
Swan Goose x Canada Goose (hybrid)
Snow/Ross's x Cackling/Canada Goose (hybrid)
Eurasian x American Wigeon (hybrid)
American Wigeon x Mallard (hybrid)
Mexican x Mottled Duck (hybrid)
Altamira x Audubon's Oriole (hybrid)
Snow x Ross's Goose (hybrid)
Snow x Greater White-fronted Goose (hybrid)
Snow Goose x Brant (hybrid)
Snow x Cackling Goose (hybrid)
Ross's x Cackling Goose (hybrid)
Greater White-fronted x Cackling Goose (hybrid)
Greater White-fronted x Canada Goose (hybrid)
Graylag x Canada Goose (hybrid)
Snow x Canada Goose (hybrid)
Blue-winged x Cinnamon Teal (hybrid)
Cinnamon Teal x Northern Shoveler (hybrid)
Wood Duck x Mallard (hybrid)
Gadwall x Mallard (hybrid)
Mallard x Northern Pintail (hybrid)
Cinnamon x Green-winged Teal (hybrid)
Canvasback x Ring-necked Duck (hybrid)
Redhead x Ring-necked Duck (hybrid)
Ring-necked Duck x Lesser Scaup (hybrid)
Redhead x scaup sp. (hybrid)
Ring-necked Duck x scaup sp. (hybrid)
Tufted Duck x scaup sp. (hybrid)
Bufflehead x Common Goldeneye (hybrid)
Common x Barrow's Goldeneye (hybrid)
Common Goldeneye x Hooded Merganser (hybrid)
Anna's x Calliope Hummingbird (hybrid)
Rufous x Allen's Hummingbird (hybrid)
Anna's x Broad-billed Hummingbird (hybrid)
American x Black Oystercatcher (hybrid)
Herring x Great Black-backed Gull (hybrid)
Herring x Glaucous Gull (hybrid)
Herring x Lesser Black-backed Gull (hybrid)
Glaucous x Glaucous-winged Gull (hybrid)
Common Black x Red-shouldered Hawk (hybrid)
Red-shouldered x Red-tailed Hawk (hybrid)
Yellow-bellied x Red-naped Sapsucker (hybrid)
Red-naped x Red-breasted Sapsucker (hybrid)
Downy x Nuttall's Woodpecker (hybrid)
Downy x Hairy Woodpecker (hybrid)
Black-capped x Mountain Chickadee (hybrid)
Dark-eyed Junco x White-throated Sparrow (hybrid)
Spotted x Eastern Towhee (hybrid)
Northern x Tropical Parula (hybrid)
Magnolia x Yellow-rumped Warbler (hybrid)
blackbird sp.
Snow/Ross's Goose
Greater/Lesser Scaup
Boat-tailed/Great-tailed Grackle
Surf/Black Scoter
Trumpeter/Tundra Swan
waterfowl sp.
Short-billed/Long-billed Dowitcher
Double-crested/Neotropic Cormorant
shearwater sp.
Red-winged/Tricolored Blackbird
Common/Red-breasted Merganser
Western/Eastern Meadowlark
Amazona sp.
new world warbler sp.
crow/raven sp.
passerine sp.
new world vulture sp.
Lesser/Greater Yellowlegs
Mallard/American Black Duck
large shorebird sp.
Bohemian/Cedar Waxwing
parrot sp.
new world sparrow sp.
Western/Glaucous-winged Gull
Bronzed/Brown-headed Cowbird
rosy-finch sp.
Domestic goose sp. (Domestic type)
gull/tern sp.
Western/Chihuahuan Meadowlark
House/Purple Finch
Mitred/Red-masked Parakeet
Zonotrichia sp.
Spizella sp./American Tree Sparrow
Common/Barrow's Goldeneye
chickadee sp.
House/Eurasian Tree Sparrow
parakeet sp.
Red-crowned/Lilac-crowned Parrot
Acanthis/Spinus sp.
Varied Thrush/American Robin
Carolina/Black-capped Chickadee
bluebird sp.
merganser sp.
Rufous/Allen's Hummingbird
Black-capped/Mountain Chickadee
Tree/Violet-green Swallow
hummingbird sp.
lovebird sp.
Psittacara sp.
Anna's/Costa's Hummingbird
California/Gambel's Quail
Tufted/Black-crested Titmouse
White-crowned/White-throated Sparrow
Northern Cardinal/Pyrrhuloxia
Yellow-crowned/Black-crowned Night Heron
Blue-winged/Cinnamon Teal
ground dove/Inca Dove
Great/Double-crested Cormorant
woodpecker sp.
Tropical/Couch's Kingbird
Sagebrush/Bell's Sparrow (Sage Sparrow)
Eurasian/African Collared-Dove
Thick-billed/Common Murre
Western/Eastern Cattle Egret
estrildid finch sp.
Ruby-crowned/Golden-crowned Kinglet
Dark-eyed/Yellow-eyed Junco
Ruby-throated/Black-chinned Hummingbird
storm-petrel sp. (white-rumped)
Sharp-shinned/Cooper's Hawk
Northern/Gilded Flicker
Cassin's/Western Kingbird
California/Woodhouse's Scrub-Jay
American Black/Mottled Duck
Western/Semipalmated Sandpiper
Red-shouldered/Broad-winged Hawk
Golden-fronted/Red-bellied Woodpecker
Downy/Ladder-backed Woodpecker
yellow-bellied kingbird sp.
Oak/Juniper Titmouse (Plain Titmouse)
Curve-billed/Bendire's Thrasher
Nelson's/Saltmarsh Sparrow (Sharp-tailed Sparrow)
Spotted/Eastern Towhee (Rufous-sided Towhee)
Passerina sp.
nighthawk sp.
Selasphorus sp.
moorhen/coot/gallinule sp.
rail/crake sp.
Black-bellied Plover/golden-plover sp.
Parasitic/Pomarine Jaeger
Herring/Glaucous-winged Gull
Sooty/Short-tailed Shearwater
Cooper's Hawk/American Goshawk
Yellow-bellied/Red-naped Sapsucker
Red-naped/Red-breasted Sapsucker
sapsucker sp.
Nuttall's/Ladder-backed Woodpecker
Loggerhead/Northern Shrike
Pacific/Winter Wren
Brown/Long-billed Thrasher
Orchard/Hooded Oriole
Louisiana/Northern Waterthrush
Townsend's/Hermit Warbler
tanager sp. (Piranga sp.)