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American Wigeon x Green-winged Teal (hybrid)
Yellow-bellied/Red-naped x Red-breasted Sapsucker (hybrid)
Magnolia x Yellow-rumped Warbler (hybrid)
Fischer's x Yellow-collared Lovebird (hybrid)
Greater White-fronted x Cackling/Canada Goose (hybrid)
Eurasian Collared-Dove x Mourning Dove (hybrid)
Black-chinned x Calliope Hummingbird (hybrid)
Rufous x Allen's Hummingbird (hybrid)
Ladder-backed x Hairy Woodpecker (hybrid)
Black-throated Gray x Townsend's Warbler (hybrid)
Golden x Lady Amherst's Pheasant (hybrid)
Hairy x White-headed Woodpecker (hybrid)
Dark-eyed Junco x White-crowned Sparrow (hybrid)
Tufted Duck x Greater Scaup (hybrid)
Red-whiskered x Red-vented Bulbul (hybrid)
California x Crissal Thrasher (hybrid)
Red-tailed x Rough-legged Hawk (hybrid)
Yellow-rumped x Hermit Warbler (hybrid)
Brown x Blue-footed Booby (hybrid)
Black-throated Gray x Hermit Warbler (hybrid)
Anna's x Rufous Hummingbird (hybrid)
American Redstart x Yellow Warbler (hybrid)
Costa's x Broad-billed Hummingbird (hybrid)
Western x Mountain Bluebird (hybrid)
Double-crested x Neotropic Cormorant (hybrid)
Black-chinned x Costa's Hummingbird (hybrid)
Yellow-rumped x Grace's Warbler (hybrid)
Emperor x Cackling Goose (hybrid)
Gadwall x Green-winged Teal (hybrid)
Yellow-breasted Chat x new world oriole sp. (hybrid)
Red-crowned x Red-lored Parrot (hybrid)
goldeneye sp. x Hooded Merganser (hybrid)
Red-crowned x Lilac-crowned Parrot (hybrid)
Yellow-bellied x Red-breasted Sapsucker (hybrid)
Eurasian x African Collared-Dove (hybrid)
Downy x Hairy Woodpecker (hybrid)
Townsend's x Black-throated Green Warbler (hybrid)
Calliope x Rufous Hummingbird (hybrid)
Cape May x Yellow-rumped Warbler (hybrid)
Northern Shoveler x American Wigeon (hybrid)
Gadwall x Northern Pintail (hybrid)
Glaucous-winged x Slaty-backed Gull (hybrid)
Common Goldeneye x Hooded Merganser (hybrid)
Black-chinned x Anna's Hummingbird (hybrid)
Black-chinned x Rufous Hummingbird (hybrid)
Anna's x Calliope Hummingbird (hybrid)
Peregrine x Prairie Falcon (hybrid)
Canvasback x Redhead (hybrid)
Emperor x Greater White-fronted Goose (hybrid)
Tufted Duck x Lesser Scaup (hybrid)
Redhead x Ring-necked Duck (hybrid)
MacGillivray's Warbler x Common Yellowthroat (hybrid)
Anna's Hummingbird x Selasphorus sp. (hybrid)
Bufflehead x Hooded Merganser (hybrid)
White-crowned x White-throated Sparrow (hybrid)
Western Kingbird x Scissor-tailed Flycatcher (hybrid)
Common Black x Red-shouldered Hawk (hybrid)
Ring-necked Duck x Lesser Scaup (hybrid)
Greater White-fronted x Cackling Goose (hybrid)
Swan Goose x Canada Goose (hybrid)
Snow x Greater White-fronted Goose (hybrid)
Yellow-bellied x Red-naped Sapsucker (hybrid)
Barnacle x Canada Goose (hybrid)
Northern x Gilded Flicker (hybrid)
Snow x Canada Goose (hybrid)
Blue-winged x Green-winged Teal (hybrid)
Anna's x Allen's Hummingbird (hybrid)
Graylag x Swan Goose (hybrid)
Mallard x Mexican Duck (hybrid)
Yellow-crowned x Black-crowned Night Heron (hybrid)
Yellow-rumped x Black-throated Gray Warbler (hybrid)
Great Knot x Surfbird (hybrid)
Black x Say's Phoebe (hybrid)
Northern Shoveler x Gadwall (hybrid)
Dark-eyed Junco x White-throated Sparrow (hybrid)
Laysan x Black-footed Albatross (hybrid)
Philadelphia x Red-eyed Vireo (hybrid)
Northern Shoveler x Mallard (hybrid)
Greater White-fronted x Canada Goose (hybrid)
Western x Clark's Grebe (hybrid)
Barrow's Goldeneye x Hooded Merganser (hybrid)
Gadwall x American Wigeon (hybrid)
Common Yellowthroat x Yellow Warbler (hybrid)
Glossy x White-faced Ibis (hybrid)
American Wigeon x Mallard (hybrid)
Brewer's Blackbird x Great-tailed Grackle (hybrid)
Tree x Barn Swallow (hybrid)
Common x Barrow's Goldeneye (hybrid)
Domestic goose sp. x Canada Goose (hybrid)
Bufflehead x Common Goldeneye (hybrid)
Graylag x Canada Goose (hybrid)
Common Gallinule x American Coot (hybrid)
Sandwich x Elegant Tern (hybrid)
Mallard x Northern Pintail (hybrid)
Wood Duck x Mallard (hybrid)
Muscovy Duck x Mallard (hybrid)
Nuttall's x Hairy Woodpecker (hybrid)
Barn x Cliff Swallow (hybrid)
Little Blue Heron x Snowy Egret (hybrid)
Rose-breasted x Black-headed Grosbeak (hybrid)
Tufted Duck x scaup sp. (hybrid)
Yellow-rumped x Townsend's Warbler (hybrid)
Glaucous x Glaucous-winged Gull (hybrid)
American Wigeon x Northern Pintail (hybrid)
Ring-necked Duck x Greater Scaup (hybrid)
White-crowned x Golden-crowned Sparrow (hybrid)
Northern Pintail x Green-winged Teal (hybrid)
Golden-crowned x White-throated Sparrow (hybrid)
Lazuli x Indigo Bunting (hybrid)
Herring x Glaucous-winged Gull (hybrid)
Nuttall's x Ladder-backed Woodpecker (hybrid)
Herring x Glaucous Gull (hybrid)
Cinnamon Teal x Northern Shoveler (hybrid)
Ring-necked Duck x scaup sp. (hybrid)
Ring-necked x Tufted Duck (hybrid)
Anna's x Costa's Hummingbird (hybrid)
Townsend's x Hermit Warbler (hybrid)
American x Black Oystercatcher (hybrid)
Downy x Nuttall's Woodpecker (hybrid)
Blue-winged x Cinnamon Teal (hybrid)
Red-naped x Red-breasted Sapsucker (hybrid)
Snow x Ross's Goose (hybrid)
Gadwall x Mallard (hybrid)
Bullock's x Baltimore Oriole (hybrid)
Golden-winged x Blue-winged Warbler (hybrid)
California x Gambel's Quail (hybrid)
Western x Glaucous-winged Gull (hybrid)
Eurasian x American Wigeon (hybrid)
Blue-winged Teal x Northern Shoveler (hybrid)
Spotted x Barred Owl (hybrid)
Domestic lovebird sp. (Domestic type)
Western/Eastern Cattle Egret
Clay-colored/Brewer's Sparrow
Philadelphia/Red-eyed Vireo
Golden-winged/Blue-winged Warbler
Great/Double-crested Cormorant
Ring-necked/Green Pheasant
whydah sp.
Oriental/Eurasian Magpie
Red-crowned/Lilac-crowned Parrot
corella/white cockatoo sp.
white-eye sp.
Black-throated Gray/Townsend's/Hermit Warbler
Spotted/Eastern Towhee (Rufous-sided Towhee)
Red-whiskered/Red-vented Bulbul
Downy/Ladder-backed Woodpecker
Petrochelidon sp.
Herring/Lesser Black-backed Gull
Phylloscopus sp.
Red-eyed/Yellow-green Vireo
vireo sp. (Red-eyed Vireo complex)
sand-plover sp.
Common Ringed/Semipalmated Plover
Spotted/Barred Owl
Black-legged/Red-legged Kittiwake
Hepatic/Summer Tanager
large macaw sp.
snipe sp.
Parus sp.
Common/Short-billed Gull
paradise-whydah sp.
Bronzed/Brown-headed Cowbird
Herring/Glaucous-winged Gull
crossbill sp.
Ammospiza sp.
pheasant sp.
quail-dove sp.
Forpus sp.
Vidua sp.
Red-necked/Little Stint
new world vulture sp.
Cliff/Cave Swallow
Greater/Lesser White-fronted Goose
Rusty/Brewer's Blackbird
large rail sp.
Laughing/Franklin's Gull
Scolopacidae sp.
Double-crested/Neotropic Cormorant
Bohemian/Cedar Waxwing
Common/Ruddy Ground Dove
Spizella sp./American Tree Sparrow
small bittern sp.
oystercatcher sp.
Herring/Iceland Gull
Varied Thrush/American Robin
Lonchura sp.
Sturnella meadowlark sp.
Psittacula sp.
Zosterops sp.
Sharp-tailed/Pectoral Sandpiper
cordonbleu sp.
Brotogeris sp.
White-winged/Stejneger's Scoter
Long-eared/Short-eared Owl
Chlidonias sp.
old world quail sp.
Serinus sp.
Streptopelia sp.
Philadelphia/Warbling Vireo
Mallard/Mexican Duck
small swift sp.
Eurasian/African Collared-Dove
Curve-billed/Bendire's Thrasher
estrildid finch sp.
Taiga/Tundra Bean-Goose
Leach's/Townsend's/Ainley's Storm-Petrel
American/Black Oystercatcher
lovebird sp.
Trumpeter/Tundra Swan
Hydrobates sp.
Buteo/eagle sp.
Leach's/Townsend's Storm-Petrel
Ploceus sp.
Sedge/Marsh Wren
Sporophila sp.
Leach's/Townsend's Storm-Petrel (white-rumped)
Thalasseus sp.
skua sp.
Arctic/Pacific Loon
Mitred/Red-masked Parakeet
Psittacara sp.
White-capped/Salvin's/Chatham Albatross
Glossy/White-faced Ibis
Lincoln's/Swamp Sparrow
Podiceps sp.
White-crowned/White-throated Sparrow
Ruby-throated/Black-chinned Hummingbird
Gray-tailed/Wandering Tattler
Yellow-footed/Western Gull
Arctic/Kamchatka Leaf Warbler
parakeet sp.
Cookilaria petrel sp.
Siberian/Amur Stonechat
Black-throated Gray/Hermit Warbler
Galapagos/Hawaiian Petrel (Dark-rumped Petrel)
eclectus sp.
procellariid sp.
yellowthroat sp.
Masked/Nazca Booby
storm-petrel sp. (white-rumped)
Louisiana/Northern Waterthrush
black-and-white shearwater sp.
large alcid sp.
moorhen/coot/gallinule sp.
Cassin's/Blue-headed Vireo
tropicbird sp.
nightjar sp.
Cooper's Hawk/American Goshawk
white-winged gull sp.
Golden/Bald Eagle
Tachycineta sp.
Pterodroma sp.
large toucan sp.
Common/Yellow-billed Loon
Timaliidae sp.
Scripps's/Craveri's Murrelet
Dryobates sp.
Tyrannus sp.
Eurasian/Oriental Skylark
Toxostoma sp.
waxbill sp.
Leach's/Townsend's Storm-Petrel (dark-rumped)
large tern sp.
Thick-billed/Common Murre
Black-throated Gray/Townsend's Warbler
Western/Semipalmated Sandpiper
Chimney/Vaux's Swift
American/Greater Flamingo
large swift sp.
parrot sp.
storm-petrel sp. (dark-rumped)
Purple/Cassin's Finch
Yellow-bellied/Red-naped Sapsucker
Black-bellied Plover/golden-plover sp.
White-winged/Yellow-chevroned Parakeet
Orchard/Hooded Oriole
Connecticut/MacGillivray's/Mourning Warbler
Myiarchus sp.
large parakeet sp. (former Aratinga sp.)
Northern/Gilded Flicker
Nuttall's/Ladder-backed Woodpecker
large falcon sp.
large shorebird sp.
Ruby-crowned/Golden-crowned Kinglet
frigatebird sp.
Chaetura sp.
Amazona sp.
Bay-breasted/Blackpoll Warbler
Long-tailed/Parasitic Jaeger
Leiothlypis sp.
pewee sp. (Contopus sp.)
Western/Glaucous-winged Gull
Haemorhous sp.
Pacific/Winter Wren
Setophaga sp.
Pheucticus sp.
Parasitic/Pomarine Jaeger
Gray/Dusky Flycatcher
yellow-bellied kingbird sp.
Townsend's/Hermit Warbler
murrelet sp.
tanager sp. (Piranga sp.)
MacGillivray's/Mourning Warbler
Scripps's/Guadalupe/Craveri's Murrelet
Passerina sp.
Cassin's/Western Kingbird
Bullock's/Baltimore Oriole
Sooty/Short-tailed Shearwater
Yellow-crowned/Black-crowned Night Heron
Common/Red-breasted Merganser
nighthawk sp.
Rose-breasted/Black-headed Grosbeak
Anna's/Costa's Hummingbird
California/Gambel's Quail
Tropical/Couch's Kingbird
golden-plover sp.
Tree/Violet-green Swallow
Eastern/Mexican Whip-poor-will
Lesser/Greater Yellowlegs
Red-winged/Tricolored Blackbird
Western/Eastern Wood-Pewee
Lazuli/Indigo Bunting
Loggerhead/Northern Shrike
Cackling/Canada Goose
Common/Barrow's Goldeneye
Red-naped/Red-breasted Sapsucker
Domestic goose sp. (Domestic type)
merganser sp.
flamingo sp.
Alder/Willow Flycatcher (Traill's Flycatcher)
Scripps's/Guadalupe Murrelet (Xantus's Murrelet)
new world sparrow sp.
Snowy/Tristan/Antipodean Albatross
solitary vireo sp.
Downy/Hairy Woodpecker
California/Woodhouse's Scrub-Jay
shearwater sp.
Sharp-shinned/Cooper's Hawk
longspur sp.
new world oriole sp.
Blue-winged/Cinnamon Teal
Cassin's/Plumbeous Vireo
Accipiter sp.
Oak/Juniper Titmouse (Plain Titmouse)
Sagebrush/Bell's Sparrow (Sage Sparrow)
new world warbler sp.
Rufous/Allen's Hummingbird
pigeon/dove sp.
new world goldfinch sp.
Hammond's/Dusky Flycatcher
phalarope sp.
new world quail sp.
hummingbird sp.
American/Pacific Golden-Plover (Lesser Golden-Plover)
Snow/Ross's Goose
Short-billed/Long-billed Dowitcher