species
100.
species
103.
species
135.
species
139.
species
168.
species
175.
species
176.
species
189.
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species
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546.
Western x Glaucous-winged Gull (hybrid)
Tufted Duck x Greater Scaup (hybrid)
Herring x Glaucous-winged Gull (hybrid)
Domestic goose sp. x Canada Goose (hybrid)
Eurasian x American Wigeon (hybrid)
Red-naped x Red-breasted Sapsucker (hybrid)
Tufted Duck x scaup sp. (hybrid)
Swan Goose x Canada Goose (hybrid)
Gadwall x Mallard (hybrid)
Glaucous x Glaucous-winged Gull (hybrid)
Greater White-fronted x Cackling Goose (hybrid)
Common Goldeneye x Hooded Merganser (hybrid)
Graylag x Canada Goose (hybrid)
Townsend's x Hermit Warbler (hybrid)
Western x Clark's Grebe (hybrid)
Mallard x Northern Pintail (hybrid)
Herring x Glaucous Gull (hybrid)
American Wigeon x Mallard (hybrid)
Muscovy Duck x Mallard (hybrid)
Snow x Cackling Goose (hybrid)
Golden-crowned x White-throated Sparrow (hybrid)
White-crowned x Golden-crowned Sparrow (hybrid)
Greater White-fronted x Canada Goose (hybrid)
Rose-breasted x Black-headed Grosbeak (hybrid)
Rufous x Allen's Hummingbird (hybrid)
Lazuli x Indigo Bunting (hybrid)
Western x Eastern Kingbird (hybrid)
Blue-winged x Cinnamon Teal (hybrid)
Snow x Canada Goose (hybrid)
Snow x Ross's Goose (hybrid)
MacGillivray's Warbler x Common Yellowthroat (hybrid)
Black-capped x Mountain Chickadee (hybrid)
Common x Barrow's Goldeneye (hybrid)
Spotted x Barred Owl (hybrid)
Bufflehead x Common Goldeneye (hybrid)
Blue-winged Teal x Northern Shoveler (hybrid)
Cinnamon Teal x Northern Shoveler (hybrid)
Graylag x Swan Goose (hybrid)
Double-crested x Neotropic Cormorant (hybrid)
Black-chinned x Anna's Hummingbird (hybrid)
Ring-necked Duck x scaup sp. (hybrid)
Canvasback x Redhead (hybrid)
Anna's x Costa's Hummingbird (hybrid)
Anna's Hummingbird x Selasphorus sp. (hybrid)
Anna's x Rufous Hummingbird (hybrid)
White-crowned x White-throated Sparrow (hybrid)
Black-chinned x Rufous Hummingbird (hybrid)
Gadwall x American Wigeon (hybrid)
Eurasian Collared-Dove x Mourning Dove (hybrid)
Yellow-bellied x Red-naped Sapsucker (hybrid)
Ring-necked Duck x Lesser Scaup (hybrid)
Barnacle x Cackling Goose (hybrid)
Northern Shoveler x American Wigeon (hybrid)
Lesser x American Goldfinch (hybrid)
Bufflehead x goldeneye sp. (hybrid)
Barrow's Goldeneye x Hooded Merganser (hybrid)
Yellow-rumped x Townsend's Warbler (hybrid)
Wood Duck x Mallard (hybrid)
goldeneye sp. x Hooded Merganser (hybrid)
Barn x Cliff Swallow (hybrid)
Summer x Western Tanager (hybrid)
Western x Mountain Bluebird (hybrid)
Black x Eastern Phoebe (hybrid)
Blue-winged x Green-winged Teal (hybrid)
Mallard x Green-winged Teal (hybrid)
Townsend's x Black-throated Green Warbler (hybrid)
American Wigeon x Northern Pintail (hybrid)
Brewster's Warbler (hybrid)
Laysan x Black-footed Albatross (hybrid)
Cinnamon x Green-winged Teal (hybrid)
Tufted Duck x Lesser Scaup (hybrid)
hummingbird sp.
Loggerhead/Northern Shrike
Tree/Violet-green Swallow
Domestic goose sp. (Domestic type)
goose sp.
Western/Glaucous-winged Gull
Snow/Ross's Goose
Rufous/Allen's Hummingbird
Sharp-shinned/Cooper's Hawk
Common/Barrow's Goldeneye
Blue-winged/Cinnamon Teal
Red-naped/Red-breasted Sapsucker
Lesser/Greater Yellowlegs
Eurasian/American Wigeon
waterfowl sp.
Red-winged/Tricolored Blackbird
Common/Red-breasted Merganser
Short-billed/Long-billed Dowitcher
Oak/Juniper Titmouse (Plain Titmouse)
nuthatch sp.
large falcon sp.
Haemorhous sp.
Sooty/Short-tailed Shearwater
Black-capped/Mountain Chickadee
Buteo/eagle sp.
Ruby-crowned/Golden-crowned Kinglet
Rusty/Brewer's Blackbird
new world quail sp.
Varied Thrush/American Robin
Herring/Iceland Gull
Anas sp.
storm-petrel sp.
Red/Red-necked Phalarope
American/Pacific Golden-Plover (Lesser Golden-Plover)
Parasitic/Pomarine Jaeger
California/Woodhouse's Scrub-Jay
large shorebird sp.
crossbill sp.
longspur sp.
Pacific/Winter Wren
Empidonax sp.
Black-bellied Plover/golden-plover sp.
Selasphorus sp.
rosy-finch sp.
Western/Semipalmated Sandpiper
Sharp-tailed/Pectoral Sandpiper
Hammond's/Dusky Flycatcher
Spizella sp.
Townsend's/Hermit Warbler
tern sp.
Mallard/Mexican Duck
Gray/Dusky Flycatcher
Rose-breasted/Black-headed Grosbeak
Setophaga sp.
Long-tailed/Parasitic Jaeger
Scolopacidae sp.
frigatebird sp.
parakeet sp.
Black-throated Gray/Hermit Warbler
Spotted/Barred Owl
new world oriole sp.
MacGillivray's/Mourning Warbler
Bullock's/Baltimore Oriole
Lazuli/Indigo Bunting
Cassin's/Plumbeous Vireo
Black-throated Gray/Townsend's Warbler
Hudsonian/Marbled Godwit
procellariid sp.
Pterodroma sp.
Eurasian/African Collared-Dove
Ring-necked/Green Pheasant
Tropical/Couch's Kingbird
Western/Eastern Meadowlark
black-and-white shearwater sp.
Cooper's Hawk/American Goshawk
yellow-bellied kingbird sp.
Cliff/Cave Swallow
white-eye sp.
Common Ringed/Semipalmated Plover
white egret sp.
nightjar sp.
Double-crested/Neotropic Cormorant
American Three-toed/Black-backed Woodpecker
Chimney/Vaux's Swift
Western/Eastern Wood-Pewee
Philadelphia/Warbling Vireo
pewee sp. (Contopus sp.)
pygmy-owl/saw-whet owl sp.
small swift sp.
redpoll sp.
Common/Hoary Redpoll
Common/Yellow-billed Loon
nighthawk sp.
storm-petrel sp. (white-rumped)
storm-petrel sp. (dark-rumped)
large tern sp.
Alder/Willow Flycatcher (Traill's Flycatcher)
solitary vireo sp.
Long-eared/Short-eared Owl
Chaetura sp.
Leiothlypis sp.
Thick-billed/Common Murre
Passer sp.
large alcid sp.
Yellow-bellied/Red-naped Sapsucker
Phylloscopus sp.
Japanese Leaf/Arctic/Kamchatka Leaf Warbler
Arctic/Kamchatka Leaf Warbler
moorhen/coot/gallinule sp.
Dryobates sp.
Common/Short-billed Gull
Scripps's/Guadalupe/Craveri's Murrelet
Scripps's/Craveri's Murrelet
Snow/McKay's Bunting
Great/Medium Egret
Procellaria sp.
Taiga/Tundra Bean-Goose
large swift sp.
snipe sp.
Galapagos/Hawaiian Petrel (Dark-rumped Petrel)
Scripps's/Guadalupe Murrelet (Xantus's Murrelet)
Sagebrush/Bell's Sparrow (Sage Sparrow)
Common/Ruddy Ground Dove
Myiarchus sp.
Cookilaria petrel sp.
Podiceps sp.
jaeger/skua sp.
Masked/Nazca Booby
King/Common Eider
Spizella sp./American Tree Sparrow
parrot sp.
large parakeet sp. (former Aratinga sp.)