species
19.
species
30.
species
121.
species
136.
species
141.
species
142.
species
148.
species
154.
species
159.
species
168.
species
171.
species
179.
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183.
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188.
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species
541.
species
542.
Herring x Glaucous-winged Gull (hybrid)
Muscovy Duck x Mallard (hybrid)
Western x Glaucous-winged Gull (hybrid)
Graylag x Canada Goose (hybrid)
White-crowned x Golden-crowned Sparrow (hybrid)
Snow x Ross's Goose (hybrid)
Graylag x Swan Goose (hybrid)
Domestic goose sp. x Canada Goose (hybrid)
Eurasian x American Wigeon (hybrid)
Red-whiskered x Red-vented Bulbul (hybrid)
Fischer's x Yellow-collared Lovebird (hybrid)
Red-naped x Red-breasted Sapsucker (hybrid)
American Wigeon x Green-winged Teal (hybrid)
Herring x Glaucous Gull (hybrid)
Red-crowned x Red-lored Parrot (hybrid)
American x Black Oystercatcher (hybrid)
Yellow-rumped x Hermit Warbler (hybrid)
Swan Goose x Canada Goose (hybrid)
Townsend's x Hermit Warbler (hybrid)
Blue-winged x Cinnamon Teal (hybrid)
Ladder-backed x Hairy Woodpecker (hybrid)
Downy x Nuttall's Woodpecker (hybrid)
Nuttall's x Ladder-backed Woodpecker (hybrid)
Hairy x White-headed Woodpecker (hybrid)
Western x Clark's Grebe (hybrid)
Anna's x Costa's Hummingbird (hybrid)
Canvasback x Redhead (hybrid)
Anna's x Allen's Hummingbird (hybrid)
Lazuli x Indigo Bunting (hybrid)
Yellow-crowned x Black-crowned Night Heron (hybrid)
Cinnamon Teal x Northern Shoveler (hybrid)
Glaucous x Glaucous-winged Gull (hybrid)
Anna's Hummingbird x Selasphorus sp. (hybrid)
Red-crowned x Lilac-crowned Parrot (hybrid)
Bullock's x Baltimore Oriole (hybrid)
Ring-necked Duck x scaup sp. (hybrid)
Townsend's x Black-throated Green Warbler (hybrid)
White-crowned x White-throated Sparrow (hybrid)
Gadwall x Mallard (hybrid)
Ring-necked Duck x Lesser Scaup (hybrid)
American Wigeon x Mallard (hybrid)
Sandwich x Elegant Tern (hybrid)
Glossy x White-faced Ibis (hybrid)
Rose-breasted x Black-headed Grosbeak (hybrid)
Rufous/Allen's Hummingbird
Red-winged/Tricolored Blackbird
blackbird sp.
Mitred/Red-masked Parakeet
Short-billed/Long-billed Dowitcher
Western/Glaucous-winged Gull
Sharp-shinned/Cooper's Hawk
new world goldfinch sp.
Domestic goose sp. (Domestic type)
Purple/Cassin's Finch
cormorant sp.
yellow-bellied kingbird sp.
parakeet sp.
Amazona sp.
Red-crowned/Lilac-crowned Parrot
Tree/Violet-green Swallow
Cassin's/Plumbeous Vireo
Common/Red-breasted Merganser
Nuttall's/Ladder-backed Woodpecker
Empidonax sp.
crow/raven sp.
Sagebrush/Bell's Sparrow (Sage Sparrow)
Spizella sp.
Red-whiskered/Red-vented Bulbul
Lesser/Greater Yellowlegs
goose sp.
falcon sp.
Herring/Glaucous-winged Gull
large parakeet sp. (former Aratinga sp.)
White-winged/Yellow-chevroned Parakeet
Psittacara sp.
tanager sp. (Piranga sp.)
gnatcatcher sp.
Double-crested/Neotropic Cormorant
Cassin's/Blue-headed Vireo
Blue-winged/Cinnamon Teal
shearwater sp.
pipit sp.
American/Black Oystercatcher
solitary vireo sp.
Orchard/Hooded Oriole
Red-naped/Red-breasted Sapsucker
Setophaga sp.
Lazuli/Indigo Bunting
Yellow-bellied/Red-naped Sapsucker
diurnal raptor sp.
Buteo/eagle sp.
Scripps's/Craveri's Murrelet
Myiarchus sp.
Common/Short-billed Gull
Domestic lovebird sp. (Domestic type)
Herring/Lesser Black-backed Gull
Sooty/Short-tailed Shearwater
new world oriole sp.
Parasitic/Pomarine Jaeger
Scripps's/Guadalupe/Craveri's Murrelet
lovebird sp.
Accipiter sp.
Zonotrichia sp.
Rose-breasted/Black-headed Grosbeak
Black-bellied Plover/golden-plover sp.
Dryobates sp.
small falcon sp.
black-and-white shearwater sp.
jaeger/skua sp.
Bullock's/Baltimore Oriole
Long-tailed/Parasitic Jaeger
Red/Red-necked Phalarope
pigeon/dove sp.
Catharus sp.
chickadee sp.
Hammond's/Dusky Flycatcher
Common/Arctic Tern
Masked/Nazca Booby
Leach's/Townsend's Storm-Petrel
Townsend's/Hermit Warbler
Passerina sp.
Forster's/Common Tern
storm-petrel sp. (white-rumped)
Eurasian/African Collared-Dove
Calidris sp.
Western/Semipalmated Sandpiper
Leach's/Townsend's Storm-Petrel (dark-rumped)
large shorebird sp.
Leach's/Townsend's Storm-Petrel (white-rumped)
new world flycatcher sp.
parrot sp.
white egret sp.
heron sp.
Gray/Dusky Flycatcher
Great/Double-crested Cormorant
Selasphorus sp.
Taiga/Tundra Bean-Goose
Pacific/Winter Wren
California/Woodhouse's Scrub-Jay
nuthatch sp.
new world quail sp.
Mallard/Mexican Duck
Pica sp.
Ruby-crowned/Golden-crowned Kinglet
Oriental/Eurasian Magpie
large macaw sp.
Eurasian/American Wigeon
Western/Eastern Wood-Pewee
pewee sp. (Contopus sp.)
Glossy/White-faced Ibis
Haemorhous sp.
white-eye sp.
whydah sp.
Oak/Juniper Titmouse (Plain Titmouse)
Black-throated Gray/Townsend's Warbler
storm-petrel sp. (dark-rumped)
moorhen/coot/gallinule sp.
large falcon sp.
Philadelphia/Warbling Vireo
Cliff/Cave Swallow
Chimney/Vaux's Swift
Leiothlypis sp.
Cassin's/Western Kingbird
Anna's/Costa's Hummingbird
procellariid sp.
Herring/Iceland Gull
waterfowl sp.
Alder/Willow Flycatcher (Traill's Flycatcher)
Scripps's/Guadalupe Murrelet (Xantus's Murrelet)
large tern sp.
small plover sp.
merganser sp.
Yellow-crowned/Black-crowned Night Heron
Leach's/Townsend's/Ainley's Storm-Petrel
Chaetura sp.
MacGillivray's/Mourning Warbler
grackle sp.
oystercatcher sp.
Lincoln's/Swamp Sparrow
Podiceps sp.
longspur sp.
waxbill sp.
snipe sp.
Ploceus sp.
American/Pacific Golden-Plover (Lesser Golden-Plover)
Hepatic/Summer Tanager
Common/Barrow's Goldeneye
Tropical/Couch's Kingbird
nighthawk sp.
Zosterops sp.
Cooper's Hawk/American Goshawk
murrelet sp.
Brotogeris sp.
Sturnella meadowlark sp.
Hydrobates sp.
rail/crake sp.
Branta sp.
estrildid finch sp.
Black-throated Gray/Hermit Warbler
Golden/Bald Eagle
shrike sp.
Forpus sp.
Vidua sp.
frigatebird sp.
Trumpeter/Tundra Swan
Lonchura sp.
gull/tern sp.
Scolopacidae sp.
Rock/Band-tailed Pigeon
Bay-breasted/Blackpoll Warbler
Psittacula sp.
Long-eared/Short-eared Owl
Serinus sp.
Streptopelia sp.
Galapagos/Hawaiian Petrel (Dark-rumped Petrel)
Arctic/Kamchatka Leaf Warbler
Louisiana/Northern Waterthrush
tropicbird sp.
golden-plover sp.
Ruby-throated/Black-chinned Hummingbird
Siberian/Amur Stonechat
eclectus sp.