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Bird Observations

Date Range:
Jan-Dec, 1900-2023

Boulder

Updated ~24 hr(s) ago.

433 species (+207 other taxa) Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Snow x Ross's Goose (hybrid)
Snow/Ross's Goose
Graylag x Swan Goose (hybrid)
Domestic goose sp. (Domestic type)
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
Greater White-fronted x Canada Goose (hybrid)
Graylag x Canada Goose (hybrid)
Domestic goose sp. x Canada Goose (hybrid)
Snow x Canada Goose (hybrid)
Cackling/Canada Goose
Snow/Ross's x Cackling/Canada Goose (hybrid)
goose sp.
Trumpeter/Tundra Swan
swan sp.
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Blue-winged x Cinnamon Teal (hybrid)
Blue-winged/Cinnamon Teal
Blue-winged Teal x Northern Shoveler (hybrid)
Cinnamon Teal x Northern Shoveler (hybrid)
Eurasian/American Wigeon
Muscovy Duck x Mallard (hybrid)
Gadwall x Mallard (hybrid)
American Wigeon x Mallard (hybrid)
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)
Gadwall x Northern Pintail (hybrid)
American Wigeon x Northern Pintail (hybrid)
Blue-winged x Green-winged Teal (hybrid)
American Wigeon x Green-winged Teal (hybrid)
Anas sp.
teal sp.
dabbling duck sp.
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Canvasback x Redhead (hybrid)
Ring-necked Duck x Greater Scaup (hybrid)
Ring-necked Duck x Lesser Scaup (hybrid)
Greater/Lesser Scaup
Ring-necked Duck x scaup sp. (hybrid)
Tufted Duck x scaup sp. (hybrid)
Aythya sp.
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
scoter sp.
Common/Barrow's Goldeneye
Common/Red-breasted Merganser
merganser sp.
duck sp.
waterfowl sp.
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Horned/Eared Grebe
Podiceps sp.
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Western x Clark's Grebe (hybrid)
Western/Clark's Grebe
grebe sp.
Rock/Band-tailed Pigeon
Patagioenas sp.
Streptopelia sp.
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
pigeon/dove sp.
Yellow-billed/Black-billed Cuckoo
nighthawk sp.
nightjar sp.
Chimney/Vaux's Swift
Chaetura sp.
large swift sp.
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
swift sp.
Ruby-throated/Black-chinned Hummingbird
Rufous x Broad-tailed Hummingbird (hybrid)
Selasphorus sp.
hummingbird sp.
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
rail/crake sp.
American/Pacific Golden-Plover (Lesser Golden-Plover)
Black-bellied Plover/golden-plover sp.
small plover sp.
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
plover sp.
godwit sp.
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Semipalmated/Western Sandpiper
peep sp.
Calidris sp.
Short-billed/Long-billed Dowitcher
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Red-necked/Red Phalarope
phalarope sp.
Greater/Lesser Yellowlegs
Tringa sp.
Scolopacidae sp.
large shorebird sp.
shorebird sp.
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
jaeger sp.
Laughing x Ring-billed Gull (hybrid)
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Herring/Iceland Gull
Herring x Glaucous-winged Gull (hybrid)
Herring x Glaucous Gull (hybrid)
Larus sp.
gull sp.
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Common/Arctic Tern
Sterna sp.
tern sp.
loon sp.
Double-crested/Neotropic Cormorant
cormorant sp.
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
white egret sp.
Black-crowned/Yellow-crowned Night-Heron
heron sp.
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec