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Bird Observations

Date Range:
Jan-Dec, 1900-2020

Boulder

Updated ~16 hr(s) ago.

414 species (+197 other taxa) Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Snow Goose
Ross's Goose
Snow x Ross's Goose (hybrid)
Snow/Ross's Goose
Graylag Goose (Domestic type)
Swan Goose (Domestic type)
Graylag x Swan Goose (Domestic type) (hybrid)
Greater White-fronted Goose
Snow x Greater White-fronted Goose (hybrid)
Domestic goose sp. (Domestic type)
Brant
Cackling Goose
Snow x Cackling Goose (hybrid)
Ross's x Cackling Goose (hybrid)
Greater White-fronted x Cackling Goose (hybrid)
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Canada Goose
Greater White-fronted x Canada Goose (hybrid)
Graylag x Canada Goose (hybrid)
Graylag Goose (Domestic type) x Canada Goose (hybrid)
Domestic goose sp. (Domestic type) x Canada Goose (hybrid)
Snow x Canada Goose (hybrid)
Cackling/Canada Goose
Snow/Ross's x Cackling/Canada Goose (hybrid)
goose sp.
Trumpeter Swan
Tundra Swan
Trumpeter/Tundra Swan
swan sp.
Wood Duck
Garganey
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Blue-winged Teal
Cinnamon Teal
Blue-winged x Cinnamon Teal (hybrid)
Blue-winged/Cinnamon Teal
Northern Shoveler
Blue-winged Teal x Northern Shoveler (hybrid)
Gadwall
Eurasian Wigeon
American Wigeon
Eurasian/American Wigeon
Mallard
Mallard (Domestic type)
Gadwall x Mallard (hybrid)
American Wigeon x Mallard (hybrid)
Mexican Duck
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Mallard x Mexican Duck (hybrid)
Mallard/Mexican Duck
Mallard x American Black Duck (hybrid)
Mallard x Mottled Duck (hybrid)
Northern Pintail
Gadwall x Northern Pintail (hybrid)
American Wigeon x Northern Pintail (hybrid)
Green-winged Teal
Blue-winged x Green-winged Teal (hybrid)
American Wigeon x Green-winged Teal (hybrid)
teal sp.
dabbling duck sp.
Canvasback
Redhead
Canvasback x Redhead (hybrid)
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Ring-necked Duck
Tufted Duck
Greater Scaup
Ring-necked Duck x Greater Scaup (hybrid)
Lesser Scaup
Ring-necked Duck x Lesser Scaup (hybrid)
Greater/Lesser Scaup
Ring-necked Duck x scaup sp. (hybrid)
Aythya sp.
Surf Scoter
White-winged Scoter
Black Scoter
scoter sp.
Long-tailed Duck
Bufflehead
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Common Goldeneye
Barrow's Goldeneye
Common/Barrow's Goldeneye
Hooded Merganser
Common Merganser
Red-breasted Merganser
Common/Red-breasted Merganser
merganser sp.
Ruddy Duck
duck sp.
waterfowl sp.
Northern Bobwhite
Red Junglefowl (Domestic type)
Ring-necked Pheasant
White-tailed Ptarmigan
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Dusky Grouse
Wild Turkey
Pied-billed Grebe
Horned Grebe
Red-necked Grebe
Eared Grebe
Horned/Eared Grebe
Podiceps sp.
Western Grebe
Clark's Grebe
Western x Clark's Grebe (hybrid)
Western/Clark's Grebe
grebe sp.
Rock Pigeon
Band-tailed Pigeon
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Rock/Band-tailed Pigeon
Patagioenas sp.
Eurasian Collared-Dove
African Collared-Dove
African Collared-Dove (Domestic type or Ringed Turtle-Dove)
Streptopelia sp.
Inca Dove
White-winged Dove
Mourning Dove
pigeon/dove sp.
Yellow-billed Cuckoo
Black-billed Cuckoo
Yellow-billed/Black-billed Cuckoo
Lesser Nighthawk
Common Nighthawk
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
nighthawk sp.
Common Poorwill
Black Swift
Chimney Swift
Chimney/Vaux's Swift
Chaetura sp.
White-throated Swift
large swift sp.
swift sp.
Rivoli's Hummingbird
Ruby-throated Hummingbird
Black-chinned Hummingbird
Ruby-throated/Black-chinned Hummingbird
Anna's Hummingbird
Broad-tailed Hummingbird
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Rufous Hummingbird
Calliope Hummingbird
Selasphorus sp.
hummingbird sp.
Virginia Rail
Sora
Common Gallinule
American Coot
rail/crake sp.
Sandhill Crane
Black-necked Stilt
American Avocet
Black-bellied Plover
American Golden-Plover
American/Pacific Golden-Plover (Lesser Golden-Plover)
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Black-bellied Plover/golden-plover sp.
Snowy Plover
Semipalmated Plover
Piping Plover
Killdeer
Mountain Plover
small plover sp.
plover sp.
Upland Sandpiper
Whimbrel
Long-billed Curlew
Marbled Godwit
godwit sp.
Ruddy Turnstone
Ruff
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Sharp-tailed Sandpiper
Stilt Sandpiper
Sanderling
Dunlin
Baird's Sandpiper
Least Sandpiper
White-rumped Sandpiper
Pectoral Sandpiper
Semipalmated Sandpiper
Western Sandpiper
Semipalmated/Western Sandpiper
peep sp.
Calidris sp.
Short-billed Dowitcher
Long-billed Dowitcher
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Short-billed/Long-billed Dowitcher
American Woodcock
Wilson's Snipe
Wilson's Phalarope
Red-necked Phalarope
Red Phalarope
Red-necked/Red Phalarope
phalarope sp.
Spotted Sandpiper
Solitary Sandpiper
Greater Yellowlegs
Willet
Lesser Yellowlegs
Greater/Lesser Yellowlegs
Tringa sp.
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Scolopacidae sp.
large shorebird sp.
shorebird sp.
Parasitic Jaeger
Long-tailed Jaeger
jaeger sp.
Ancient Murrelet
Black-legged Kittiwake
Sabine's Gull
Bonaparte's Gull
Black-headed Gull
Little Gull
Ross's Gull
Laughing Gull
Franklin's Gull
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Mew Gull
Ring-billed Gull
Laughing x Ring-billed Gull (hybrid)
Western Gull
California Gull
Herring Gull
Iceland Gull
Herring/Iceland Gull
Lesser Black-backed Gull
Glaucous-winged Gull
Herring x Glaucous-winged Gull (hybrid)
Glaucous Gull
Herring x Glaucous Gull (hybrid)
Great Black-backed Gull
Larus sp.
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
gull sp.
Least Tern
Caspian Tern
Black Tern
Common Tern
Arctic Tern
Common/Arctic Tern
Forster's Tern
Sterna sp.
tern sp.
Red-throated Loon
Pacific Loon
Common Loon
Yellow-billed Loon
loon sp.
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Double-crested Cormorant
Neotropic/Double-crested Cormorant
cormorant sp.
American White Pelican
Brown Pelican
American Bittern
Least Bittern
Great Blue Heron
Great Egret
Snowy Egret
Little Blue Heron
Tricolored Heron
Cattle Egret
white egret sp.
Green Heron
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Black-crowned Night-Heron
Yellow-crowned Night-Heron
Black-crowned/Yellow-crowned Night-Heron
heron sp.
Glossy Ibis
White-faced Ibis
Glossy x White-faced Ibis (hybrid)
Glossy/White-faced Ibis
Turkey Vulture
Osprey
Golden Eagle
Mississippi Kite
Northern Harrier
Sharp-shinned Hawk
Cooper's Hawk
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Sharp-shinned/Cooper's Hawk
Northern Goshawk
Cooper's Hawk/Northern Goshawk
Accipiter sp.
Bald Eagle
Golden/Bald Eagle
Red-shouldered Hawk
Broad-winged Hawk
Swainson's Hawk
Zone-tailed Hawk