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Bird Observations

Date Range:
Dec, 1900-2020

Boulder

Updated ~28 hr(s) ago.

213 species (+80 other taxa) Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
 
 
Snow/Ross's Goose
 
 
 
Domestic goose sp. (Domestic type)
 
 
Snow x Cackling Goose (hybrid)
 
Ross's x Cackling Goose (hybrid)
 
Greater White-fronted x Cackling Goose (hybrid)
 
 
Greater White-fronted x Canada Goose (hybrid)
 
Graylag x Canada Goose (hybrid)
 
Domestic goose sp. x Canada Goose (hybrid)
 
Snow x Canada Goose (hybrid)
 
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Cackling/Canada Goose
 
Snow/Ross's x Cackling/Canada Goose (hybrid)
 
 
 
 
Trumpeter/Tundra Swan
 
swan sp.
 
goose sp.
 
 
 
 
 
 
 
Muscovy Duck x Mallard (hybrid)
 
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Gadwall x Mallard (hybrid)
 
 
Mallard x Mexican Duck (hybrid)
 
Mallard/Mexican Duck
 
Mallard x American Black Duck (hybrid)
 
 
 
teal sp.
 
dabbling duck sp.
 
 
 
 
 
 
Greater/Lesser Scaup
 
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Aythya sp.
 
 
 
 
 
 
 
 
Common/Barrow's Goldeneye
 
 
 
 
Common/Red-breasted Merganser
 
merganser sp.
 
 
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
duck sp.
 
 
 
 
 
 
 
 
 
Horned/Eared Grebe
 
 
 
Western x Clark's Grebe (hybrid)
 
Western/Clark's Grebe
 
grebe sp.
 
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
 
 
 
Streptopelia sp.
 
 
 
pigeon/dove sp.
 
 
 
 
 
 
 
 
 
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
 
 
 
 
 
 
 
 
 
Herring x Glaucous-winged Gull (hybrid)
 
 
Herring/Iceland Gull
 
Larus sp.
 
gull sp.
 
 
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
 
 
 
loon sp.
 
 
Double-crested/Neotropic Cormorant
 
 
 
 
 
 
 
 
 
 
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Sharp-shinned/Cooper's Hawk
 
 
Accipiter sp.
 
 
Golden/Bald Eagle
 
 
 
 
Buteo sp.
 
Buteo/eagle sp.
 
hawk sp.
 
eagle sp.
 
 
 
 
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
 
 
 
 
owl sp.
 
 
 
 
 
Yellow-bellied/Red-naped Sapsucker
 
 
 
 
 
 
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Downy/Hairy Woodpecker
 
 
woodpecker sp.
 
 
 
 
 
 
large falcon sp.
 
small falcon sp.
 
falcon sp.
 
diurnal raptor sp.
 
 
 
 
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
phoebe sp.
 
 
 
Loggerhead/Northern Shrike
 
shrike sp.
 
 
 
 
 
 
 
 
 
 
 
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
raven sp.
 
crow/raven sp.
 
 
 
Black-capped x Mountain Chickadee (hybrid)
 
Black-capped/Mountain Chickadee
 
chickadee sp.
 
 
 
 
 
Ruby-crowned/Golden-crowned Kinglet
 
 
 
 
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
nuthatch sp.
 
 
 
 
 
 
 
 
Pacific/Winter Wren
 
 
 
 
 
 
 
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
 
 
 
 
bluebird sp.
 
 
 
 
 
 
 
Bohemian/Cedar Waxwing
 
 
 
 
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
 
 
 
 
 
 
rosy-finch sp.
 
 
 
 
 
 
 
 
 
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
 
 
 
new world goldfinch sp.
 
finch sp.
 
 
 
 
 
 
 
 
 
 
 
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Zonotrichia sp.
 
 
 
 
 
 
 
 
 
new world sparrow sp.
 
 
 
Sturnella meadowlark sp.
 
 
 
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
 
 
 
Rusty/Brewer's Blackbird
 
 
 
grackle sp.
 
blackbird sp.
 
 
 
 
 
 
 
 
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
 
Setophaga sp.
 
 
new world warbler sp.
 
 
 
passerine sp.
 
bird sp.
 

KEY:| = insufficient data | = rare to widespread

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