BBS Route · Colorado · BCR 16
Aspen Bird Survey Route
A standard 50-stop Breeding Bird Survey route. 107 species recorded across 39 survey years, still active.
107Species Recorded
39Years Surveyed
1979–2024Span
7Observers
Bird Species Found on Colorado Aspen
Top 40 of 107 species by most recent count. Each links to its species trend.
| History | ||||||
|---|---|---|---|---|---|---|
| Violet-green Swallow | Hirundinidae | 89 | 2024 | 15× | 1983 | |
| American Robin | Turdidae | 64 | 2024 | -17% | 1983 | |
| Warbling Vireo | Vireonidae | 42 | 2024 | +147% | 1983 | |
| Yellow Warbler | Parulidae | 40 | 2024 | +1% | 1983 | |
| Black-billed Magpie | Corvidae | 39 | 2024 | -54% | 1983 | |
| Song Sparrow | Passerellidae | 34 | 2024 | +39% | 1983 | |
| Broad-tailed Hummingbird | Trochilidae | 29 | 2024 | +13% | 1983 | |
| Northern House Wren | Troglodytidae | 14 | 2024 | +174% | 1983 | |
| Chipping Sparrow | Passerellidae | 12 | 2024 | +290% | 1986 | |
| MacGillivray's Warbler | Parulidae | 12 | 2024 | +36% | 1984 | |
| Orange-crowned Warbler | Parulidae | 12 | 2024 | +300% | 1994 | |
| Brown-headed Cowbird | Icteridae | 10 | 2024 | -40% | 1983 | |
| Ruby-crowned Kinglet | Regulidae | 10 | 2024 | +40% | 1983 | |
| Spotted Towhee | Passerellidae | 10 | 2024 | +800% | 1997 | |
| Western Wood-Pewee | Tyrannidae | 9 | 2024 | +167% | 1983 | |
| Red-winged Blackbird | Icteridae | 9 | 2024 | -68% | 1983 | |
| Green-tailed Towhee | Passerellidae | 9 | 2024 | -37% | 1984 | |
| Swainson's Thrush | Turdidae | 9 | 2024 | +80% | 1983 | |
| House Finch | Fringillidae | 7 | 2024 | +450% | 1989 | |
| American Crow | Corvidae | 7 | 2024 | +138% | 1996 | |
| Brewer's Blackbird | Icteridae | 6 | 2024 | -87% | 1983 | |
| Hermit Thrush | Turdidae | 6 | 2006 | -25% | 1984 | |
| Common Nighthawk | Caprimulgidae | 5 | 2010 | +400% | 2009 | |
| Red-tailed Hawk | Accipitridae | 4 | 2024 | -11% | 1984 | |
| White-throated Swift | Apodidae | 4 | 1990 | -67% | 1979 | |
| Lesser Goldfinch | Fringillidae | 4 | 2023 | +100% | 2017 | |
| American Kestrel | Falconidae | 3 | 2024 | -57% | 1984 | |
| Lazuli Bunting | Cardinalidae | 3 | 2024 | +300% | 1984 | |
| Tree Swallow | Hirundinidae | 3 | 2024 | -54% | 1983 | |
| Lewis's Woodpecker | Picidae | 3 | 2023 | +20% | 2017 | |
| Dusky Flycatcher | Tyrannidae | 3 | 2021 | +50% | 1995 | |
| Black-headed Grosbeak | Cardinalidae | 3 | 2024 | +60% | 1986 | |
| White-breasted Nuthatch | Sittidae | 3 | 2024 | +120% | 1989 | |
| Mountain Bluebird | Turdidae | 3 | 2024 | +75% | 1989 | |
| Northern Cardinal | Cardinalidae | 3 | 1990 | n/a | n/a | |
| Bullock's Oriole | Icteridae | 3 | 2024 | +175% | 1997 | |
| Osprey | Pandionidae | 3 | 2024 | +100% | 2022 | |
| European Starling | Sturnidae | 2 | 2024 | -70% | 1983 | |
| Lincoln's Sparrow | Passerellidae | 2 | 2024 | -29% | 1984 | |
| American Dipper | Cinclidae | 2 | 2013 | +29% | 1984 |
Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22. A route is a sample, not a census.