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Bird Observations

			Date Range: Oct, 1900-2020

Boulder

Updated ~39 hr(s) ago.

302 species (+105 other taxa)	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Snow Goose
Ross's Goose
Snow/Ross's Goose
Greater White-fronted Goose
Cackling Goose
Snow x Cackling Goose (hybrid)
Canada Goose
Graylag x Canada Goose (hybrid)
Domestic goose sp. x Canada Goose (hybrid)
Cackling/Canada Goose
Snow/Ross's x Cackling/Canada Goose (hybrid)
Mute Swan
Tundra Swan
swan sp.
goose sp.
	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Wood Duck
Blue-winged Teal
Cinnamon Teal
Blue-winged/Cinnamon Teal
Northern Shoveler
Gadwall
American Wigeon
Mallard
Muscovy Duck x Mallard (hybrid)
Mexican Duck
Mallard x Mexican Duck (hybrid)
Mallard/Mexican Duck
Northern Pintail
Green-winged Teal
teal sp.
	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
dabbling duck sp.
Canvasback
Redhead
Ring-necked Duck
Greater Scaup
Lesser Scaup
Greater/Lesser Scaup
Aythya sp.
Surf Scoter
White-winged Scoter
Black Scoter
scoter sp.
Long-tailed Duck
Bufflehead
Common Goldeneye
	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Barrow's Goldeneye
Common/Barrow's Goldeneye
Hooded Merganser
Common Merganser
Red-breasted Merganser
Common/Red-breasted Merganser
merganser sp.
Ruddy Duck
duck sp.
Northern Bobwhite
Gambel's Quail
Wild Turkey
Dusky Grouse
White-tailed Ptarmigan
Ring-necked Pheasant
	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Pied-billed Grebe
Horned Grebe
Red-necked Grebe
Eared Grebe
Horned/Eared Grebe
Western Grebe
Clark's Grebe
Western x Clark's Grebe (hybrid)
Western/Clark's Grebe
grebe sp.
Rock Pigeon
Eurasian Collared-Dove
African Collared-Dove
Streptopelia sp.
White-winged Dove
	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Mourning Dove
pigeon/dove sp.
Yellow-billed Cuckoo
Common Nighthawk
nighthawk sp.
Common Poorwill
White-throated Swift
swift sp.
Rivoli's Hummingbird
Ruby-throated Hummingbird
Black-chinned Hummingbird
Anna's Hummingbird
Rufous Hummingbird
Broad-tailed Hummingbird
Selasphorus sp.
	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
hummingbird sp.
Virginia Rail
Sora
American Coot
Sandhill Crane
Black-necked Stilt
American Avocet
Black-bellied Plover
American Golden-Plover
Killdeer
Semipalmated Plover
plover sp.
Marbled Godwit
Short-billed Dowitcher
Long-billed Dowitcher
	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Short-billed/Long-billed Dowitcher
Wilson's Snipe
Wilson's Phalarope
Red Phalarope
Red-necked Phalarope
Spotted Sandpiper
Solitary Sandpiper
Lesser Yellowlegs
Willet
Greater Yellowlegs
Lesser/Greater Yellowlegs
Tringa sp.
Sharp-tailed Sandpiper
Stilt Sandpiper
Sanderling
	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Dunlin
Baird's Sandpiper
Least Sandpiper
Pectoral Sandpiper
Semipalmated Sandpiper
peep sp.
Calidris sp.
large shorebird sp.
shorebird sp.
Parasitic Jaeger
Little Gull
Ross's Gull
Sabine's Gull
Bonaparte's Gull
Laughing Gull
	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Franklin's Gull
Short-billed Gull
Ring-billed Gull
Herring Gull
Lesser Black-backed Gull
California Gull
Iceland Gull
Larus sp.
gull sp.
Black Tern
Forster's Tern
Arctic Tern
Common Tern
Common/Arctic Tern
Sterna sp.
	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
tern sp.
Red-throated Loon
Pacific Loon
Common Loon
loon sp.
Double-crested Cormorant
Double-crested/Neotropic Cormorant
American White Pelican
American Bittern
Black-crowned Night Heron
Tricolored Heron
Snowy Egret
Green Heron
Western Cattle Egret
Great Egret
	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Great Blue Heron
white egret sp.
White-faced Ibis
Glossy/White-faced Ibis
Turkey Vulture
Osprey
Golden Eagle
Northern Harrier
Sharp-shinned Hawk
Cooper's Hawk
Sharp-shinned/Cooper's Hawk
American Goshawk
Accipiter sp.
Bald Eagle
Golden/Bald Eagle
	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Broad-winged Hawk
Swainson's Hawk
Red-tailed Hawk
Rough-legged Hawk
Ferruginous Hawk
Buteo sp.
Buteo/eagle sp.
hawk sp.
Barn Owl
Eastern Screech-Owl
Great Horned Owl
Northern Pygmy-Owl
Burrowing Owl
Long-eared Owl
Short-eared Owl
	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Northern Saw-whet Owl
owl sp.
Belted Kingfisher
Williamson's Sapsucker
Yellow-bellied Sapsucker
Red-naped Sapsucker
Yellow-bellied/Red-naped Sapsucker
sapsucker sp.
Lewis's Woodpecker
Red-headed Woodpecker
American Three-toed Woodpecker
Downy Woodpecker
Hairy Woodpecker
Downy/Hairy Woodpecker
Northern Flicker
	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
woodpecker sp.
American Kestrel
Merlin
Peregrine Falcon
Prairie Falcon
large falcon sp.
small falcon sp.
falcon sp.
diurnal raptor sp.
Western Wood-Pewee
Western/Eastern Wood-Pewee
pewee sp. (Contopus sp.)
Hammond's Flycatcher
Dusky Flycatcher
Empidonax sp.
	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Black Phoebe
Eastern Phoebe
Say's Phoebe
Vermilion Flycatcher
Cassin's Kingbird
Western Kingbird
Fork-tailed Flycatcher
new world flycatcher sp.
Cassin's Vireo
Blue-headed Vireo
Cassin's/Blue-headed Vireo
Plumbeous Vireo
Philadelphia Vireo
Warbling Vireo
vireo sp.
	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Northern Shrike
Loggerhead/Northern Shrike
shrike sp.
Canada Jay
Pinyon Jay
Steller's Jay
Blue Jay
Woodhouse's Scrub-Jay
jay sp.
Black-billed Magpie
Clark's Nutcracker
American Crow
Common Raven
raven sp.
crow/raven sp.
	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Black-capped Chickadee
Mountain Chickadee
Black-capped x Mountain Chickadee (hybrid)
Black-capped/Mountain Chickadee
chickadee sp.
Horned Lark
Tree Swallow
Violet-green Swallow
Northern Rough-winged Swallow
Barn Swallow
swallow sp.
Bushtit
Ruby-crowned Kinglet
Golden-crowned Kinglet
Ruby-crowned/Golden-crowned Kinglet
	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
White-breasted Nuthatch
Pygmy Nuthatch
Red-breasted Nuthatch
nuthatch sp.
Brown Creeper
Blue-gray Gnatcatcher
Rock Wren
Canyon Wren
House Wren
Winter Wren
Pacific/Winter Wren
Marsh Wren
Carolina Wren
Bewick's Wren
wren sp.
	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
American Dipper
European Starling
Gray Catbird
Brown Thrasher
Sage Thrasher
Northern Mockingbird
Eastern Bluebird
Western Bluebird
Mountain Bluebird
bluebird sp.
Townsend's Solitaire
Swainson's Thrush
Hermit Thrush
Catharus sp.
Wood Thrush
	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
American Robin
thrush sp.
Bohemian Waxwing
Cedar Waxwing
House Sparrow
American Pipit
Sprague's Pipit
pipit sp.
Evening Grosbeak
Pine Grosbeak
Gray-crowned Rosy-Finch
Brown-capped Rosy-Finch
rosy-finch sp.
House Finch
Purple Finch
	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Cassin's Finch
Haemorhous sp.
Red Crossbill
Pine Siskin
Lesser Goldfinch
American Goldfinch
new world goldfinch sp.
finch sp.
Lapland Longspur
Chestnut-collared Longspur
Thick-billed Longspur
Grasshopper Sparrow
Chipping Sparrow
Clay-colored Sparrow
Field Sparrow
	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Brewer's Sparrow
Spizella sp.
Lark Sparrow
Lark Bunting
American Tree Sparrow
Spizella sp./American Tree Sparrow
Fox Sparrow
Dark-eyed Junco
White-crowned Sparrow
Golden-crowned Sparrow
Harris's Sparrow
White-throated Sparrow
White-crowned/White-throated Sparrow
Zonotrichia sp.
Sagebrush Sparrow
	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Vesper Sparrow
Savannah Sparrow
Baird's Sparrow
Song Sparrow
Lincoln's Sparrow
Swamp Sparrow
Green-tailed Towhee
Spotted Towhee
Eastern Towhee
Spotted/Eastern Towhee (Rufous-sided Towhee)
new world sparrow sp.
Yellow-breasted Chat
Yellow-headed Blackbird
Western Meadowlark
Sturnella meadowlark sp.
	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Red-winged Blackbird
Brown-headed Cowbird
Rusty Blackbird
Brewer's Blackbird
Rusty/Brewer's Blackbird
Common Grackle
Great-tailed Grackle
grackle sp.
blackbird sp.
Ovenbird
Northern Waterthrush
Black-and-white Warbler
Tennessee Warbler
Orange-crowned Warbler
Nashville Warbler
	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Virginia's Warbler
MacGillivray's Warbler
Common Yellowthroat
American Redstart
Cape May Warbler
Northern Parula
Magnolia Warbler
Blackburnian Warbler
Chestnut-sided Warbler
Blackpoll Warbler
Black-throated Blue Warbler
Palm Warbler
Pine Warbler
Yellow-rumped Warbler
Yellow-throated Warbler
	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Townsend's Warbler
Black-throated Green Warbler
Canada Warbler
Wilson's Warbler
new world warbler sp.
Scarlet Tanager
Western Tanager
Northern Cardinal
Rose-breasted Grosbeak
Black-headed Grosbeak
Rose-breasted/Black-headed Grosbeak
Blue Grosbeak
Lazuli Bunting
Indigo Bunting
Sporophila sp.
	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
passerine sp.
bird sp.

KEY:| = insufficient data | = rare to widespread

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