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Bird Observations

			Date Range: May, 1900-2020

Boulder

Updated ~22 hr(s) ago.

336 species (+124 other taxa)	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Snow Goose
Swan Goose
Greater White-fronted Goose
Cackling Goose
Canada Goose
Graylag x Canada Goose (hybrid)
Domestic goose sp. x Canada Goose (hybrid)
Cackling/Canada Goose
Mute Swan
Trumpeter Swan
goose sp.
Wood Duck
Garganey
Blue-winged Teal
Cinnamon Teal
	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Blue-winged x Cinnamon Teal (hybrid)
Blue-winged/Cinnamon Teal
Northern Shoveler
Blue-winged Teal x Northern Shoveler (hybrid)
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.
dabbling duck sp.
	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Canvasback
Redhead
Ring-necked Duck
Greater Scaup
Lesser Scaup
Greater/Lesser Scaup
Aythya sp.
Bufflehead
Common Goldeneye
Hooded Merganser
Common Merganser
Red-breasted Merganser
Common/Red-breasted Merganser
Ruddy Duck
duck sp.
	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Northern Bobwhite
Wild Turkey
Dusky Grouse
White-tailed Ptarmigan
Ring-necked Pheasant
Indian Peafowl
Red Junglefowl
Pied-billed Grebe
Horned Grebe
Eared Grebe
Horned/Eared Grebe
Western Grebe
Clark's Grebe
Western x Clark's Grebe (hybrid)
Western/Clark's Grebe
	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
grebe sp.
Rock Pigeon
Band-tailed Pigeon
Eurasian Collared-Dove
African Collared-Dove
Streptopelia sp.
White-winged Dove
Mourning Dove
pigeon/dove sp.
Yellow-billed Cuckoo
Lesser Nighthawk
Common Nighthawk
nighthawk sp.
Common Poorwill
Black Swift
	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Chimney Swift
Chimney/Vaux's Swift
Chaetura sp.
White-throated Swift
large swift sp.
swift sp.
Ruby-throated Hummingbird
Black-chinned Hummingbird
Ruby-throated/Black-chinned Hummingbird
Calliope Hummingbird
Rufous Hummingbird
Broad-tailed Hummingbird
Selasphorus sp.
hummingbird sp.
Virginia Rail
	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Sora
American Coot
rail/crake sp.
Sandhill Crane
Black-necked Stilt
American Avocet
Black-bellied Plover
American Golden-Plover
Killdeer
Semipalmated Plover
Piping Plover
Snowy Plover
plover sp.
Upland Sandpiper
Whimbrel
	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Long-billed Curlew
Marbled Godwit
godwit sp.
Short-billed Dowitcher
Long-billed Dowitcher
Short-billed/Long-billed Dowitcher
Wilson's Snipe
Wilson's Phalarope
Red-necked Phalarope
Red/Red-necked Phalarope
phalarope sp.
Spotted Sandpiper
Solitary Sandpiper
Lesser Yellowlegs
Willet
	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Greater Yellowlegs
Lesser/Greater Yellowlegs
Tringa sp.
Ruddy Turnstone
Ruff
Stilt Sandpiper
Sanderling
Dunlin
Baird's Sandpiper
White-rumped Sandpiper
Least Sandpiper
Pectoral Sandpiper
Western Sandpiper
Semipalmated Sandpiper
Western/Semipalmated Sandpiper
	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
peep sp.
Calidris sp.
Scolopacidae sp.
shorebird sp.
Bonaparte's Gull
Franklin's Gull
Ring-billed Gull
California Gull
Larus sp.
gull sp.
Least Tern
Caspian Tern
Black Tern
Forster's Tern
Common Tern
	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
tern sp.
Red-throated Loon
Common Loon
Double-crested Cormorant
Double-crested/Neotropic Cormorant
American White Pelican
American Bittern
Least Bittern
Yellow-crowned Night Heron
Black-crowned Night Heron
Little Blue 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.
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
Sharp-shinned/Cooper's Hawk
American Goshawk
	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Accipiter sp.
Bald Eagle
Golden/Bald Eagle
Red-shouldered Hawk
Broad-winged Hawk
Swainson's Hawk
Red-tailed Hawk
Ferruginous Hawk
Buteo sp.
Buteo/eagle sp.
hawk sp.
eagle sp.
Barn Owl
Flammulated Owl
Eastern Screech-Owl
	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Great Horned Owl
Northern Pygmy-Owl
Long-eared Owl
Short-eared Owl
Northern Saw-whet Owl
owl sp.
Belted Kingfisher
Williamson's Sapsucker
Red-naped Sapsucker
Yellow-bellied/Red-naped Sapsucker
Lewis's Woodpecker
Red-headed Woodpecker
Acorn Woodpecker
American Three-toed Woodpecker
Downy Woodpecker
	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Hairy Woodpecker
Downy/Hairy Woodpecker
Dryobates sp.
Northern Flicker
woodpecker sp.
American Kestrel
Merlin
Peregrine Falcon
Prairie Falcon
large falcon sp.
small falcon sp.
falcon sp.
diurnal raptor sp.
Budgerigar
Olive-sided Flycatcher
	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Western Wood-Pewee
Western/Eastern Wood-Pewee
pewee sp. (Contopus sp.)
Alder Flycatcher
Willow Flycatcher
Alder/Willow Flycatcher (Traill's Flycatcher)
Least Flycatcher
Hammond's Flycatcher
Gray Flycatcher
Dusky Flycatcher
Hammond's/Dusky Flycatcher
Gray/Dusky Flycatcher
Western Flycatcher
Empidonax sp.
Black Phoebe
	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Eastern Phoebe
Black x Eastern Phoebe (hybrid)
Say's Phoebe
phoebe sp.
Ash-throated Flycatcher
Cassin's Kingbird
Western Kingbird
Cassin's/Western Kingbird
yellow-bellied kingbird sp.
Eastern Kingbird
Scissor-tailed Flycatcher
new world flycatcher sp.
White-eyed Vireo
Bell's Vireo
Yellow-throated Vireo
	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Cassin's Vireo
Plumbeous Vireo
Cassin's/Plumbeous Vireo
solitary vireo sp.
Philadelphia Vireo
Warbling Vireo
Red-eyed Vireo
vireo sp.
Loggerhead Shrike
Loggerhead/Northern Shrike
Canada Jay
Pinyon Jay
Steller's Jay
Blue Jay
Woodhouse's Scrub-Jay
	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Black-billed Magpie
Clark's Nutcracker
American Crow
Common Raven
raven sp.
crow/raven sp.
Black-capped Chickadee
Mountain Chickadee
Black-capped/Mountain Chickadee
chickadee sp.
Horned Lark
Bank Swallow
Tree Swallow
Violet-green Swallow
Tree/Violet-green Swallow
	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Purple Martin
Northern Rough-winged Swallow
Barn Swallow
Cliff Swallow
swallow sp.
Bushtit
Ruby-crowned Kinglet
Golden-crowned Kinglet
Ruby-crowned/Golden-crowned Kinglet
White-breasted Nuthatch
Pygmy Nuthatch
Red-breasted Nuthatch
nuthatch sp.
Brown Creeper
Blue-gray Gnatcatcher
	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Rock Wren
Canyon Wren
House Wren
Pacific/Winter Wren
Marsh Wren
Sedge/Marsh Wren
Carolina Wren
Bewick's Wren
wren sp.
American Dipper
European Starling
Gray Catbird
Brown Thrasher
Sage Thrasher
Northern Mockingbird
	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Eastern Bluebird
Western Bluebird
Mountain Bluebird
bluebird sp.
Townsend's Solitaire
Varied Thrush
Veery
Gray-cheeked Thrush
Swainson's Thrush
Hermit Thrush
Catharus sp.
American Robin
Bohemian Waxwing
Cedar Waxwing
Bohemian/Cedar Waxwing
	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Phainopepla
House Sparrow
American Pipit
pipit sp.
Evening Grosbeak
Pine Grosbeak
Black Rosy-Finch
Brown-capped Rosy-Finch
rosy-finch sp.
House Finch
Cassin's Finch
Haemorhous sp.
Common Redpoll
Red Crossbill
Pine Siskin
	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Lesser Goldfinch
American Goldfinch
new world goldfinch sp.
finch sp.
Chestnut-collared Longspur
Thick-billed Longspur
longspur sp.
Cassin's Sparrow
Grasshopper Sparrow
Chipping Sparrow
Clay-colored Sparrow
Field Sparrow
Brewer's Sparrow
Spizella sp.
Black-throated Sparrow
	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Lark Sparrow
Lark Bunting
Spizella sp./American Tree Sparrow
Fox Sparrow
Dark-eyed Junco
White-crowned Sparrow
Golden-crowned Sparrow
Harris's Sparrow
White-throated Sparrow
Zonotrichia sp.
Sagebrush Sparrow
Vesper Sparrow
Savannah Sparrow
Song Sparrow
Lincoln's Sparrow
	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Swamp Sparrow
Green-tailed Towhee
Spotted Towhee
Spotted/Eastern Towhee (Rufous-sided Towhee)
towhee sp.
new world sparrow sp.
Yellow-breasted Chat
Yellow-headed Blackbird
Bobolink
Western Meadowlark
Eastern Meadowlark
Sturnella meadowlark sp.
Orchard Oriole
Bullock's Oriole
Baltimore Oriole
	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Bullock's x Baltimore Oriole (hybrid)
Bullock's/Baltimore Oriole
Scott's Oriole
new world oriole sp.
Red-winged Blackbird
Brown-headed Cowbird
Brewer's Blackbird
Rusty/Brewer's Blackbird
Common Grackle
Great-tailed Grackle
grackle sp.
blackbird sp.
Ovenbird
Worm-eating Warbler
Northern Waterthrush
	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Golden-winged Warbler
Blue-winged Warbler
Black-and-white Warbler
Prothonotary Warbler
Swainson's Warbler
Tennessee Warbler
Orange-crowned Warbler
Nashville Warbler
Virginia's Warbler
Connecticut Warbler
MacGillivray's Warbler
Mourning Warbler
MacGillivray's/Mourning Warbler
Kentucky Warbler
Common Yellowthroat
	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Hooded Warbler
American Redstart
Cape May Warbler
Northern Parula
Magnolia Warbler
Bay-breasted Warbler
Blackburnian Warbler
Yellow 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
Prairie Warbler
Black-throated Gray Warbler
Townsend's Warbler
Hermit Warbler
Black-throated Green Warbler
Setophaga sp.
Wilson's Warbler
new world warbler sp.
Summer Tanager
Scarlet Tanager
Western Tanager
tanager sp. (Piranga sp.)
Northern Cardinal
Rose-breasted Grosbeak
Black-headed Grosbeak
	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Rose-breasted x Black-headed Grosbeak (hybrid)
Rose-breasted/Black-headed Grosbeak
Blue Grosbeak
Lazuli Bunting
Indigo Bunting
Lazuli x Indigo Bunting (hybrid)
Lazuli/Indigo Bunting
Painted Bunting
passerine sp.
bird sp.

KEY:| = insufficient data | = rare to widespread

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