BBS Route · Colorado · BCR 16
Castleton Bird Survey Route
A standard 50-stop Breeding Bird Survey route. 112 species recorded across 31 survey years, still active.
112Species Recorded
31Years Surveyed
1988–2024Span
4Observers
Bird Species Found on Colorado Castleton
Top 40 of 112 species by most recent count. Each links to its species trend.
| History | ||||||
|---|---|---|---|---|---|---|
| Red-winged Blackbird | Icteridae | 118 | 2024 | -62% | 1992 | |
| American Robin | Turdidae | 62 | 2024 | -58% | 1992 | |
| Yellow Warbler | Parulidae | 45 | 2024 | -24% | 1992 | |
| Black-billed Magpie | Corvidae | 43 | 2024 | 19× | 1996 | |
| Western Wood-Pewee | Tyrannidae | 31 | 2024 | +165% | 1992 | |
| White-crowned Sparrow | Passerellidae | 29 | 2024 | -14% | 1992 | |
| Savannah Sparrow | Passerellidae | 27 | 2024 | -24% | 1994 | |
| Warbling Vireo | Vireonidae | 27 | 2024 | +493% | 1994 | |
| Pine Siskin | Fringillidae | 24 | 2024 | +63% | 1992 | |
| Green-tailed Towhee | Passerellidae | 24 | 2024 | +156% | 1994 | |
| Brewer's Blackbird | Icteridae | 23 | 2024 | -43% | 1994 | |
| Lincoln's Sparrow | Passerellidae | 23 | 2024 | +82% | 1994 | |
| Broad-tailed Hummingbird | Trochilidae | 22 | 2024 | +30% | 1992 | |
| Tree Swallow | Hirundinidae | 18 | 2024 | -55% | 1994 | |
| Western Tanager | Cardinalidae | 15 | 2024 | +633% | 1994 | |
| House Sparrow | Passeridae | 15 | 2024 | -60% | 1994 | |
| Ruby-crowned Kinglet | Regulidae | 14 | 2024 | +28% | 1996 | |
| Wilson's Snipe | Scolopacidae | 12 | 2024 | -12% | 1992 | |
| Song Sparrow | Passerellidae | 12 | 2024 | +61% | 1996 | |
| Western Meadowlark | Icteridae | 10 | 2024 | -26% | 1992 | |
| Cliff Swallow | Hirundinidae | 10 | 2024 | -85% | 1994 | |
| White-throated Swift | Apodidae | 10 | 1991 | n/a | n/a | |
| Northern House Wren | Troglodytidae | 7 | 2024 | -30% | 1994 | |
| Eurasian Collared-Dove | Columbidae | 7 | 2024 | +11% | 2010 | |
| European Starling | Sturnidae | 6 | 2024 | -77% | 1992 | |
| House Finch | Fringillidae | 6 | 2024 | +0% | 1998 | |
| MacGillivray's Warbler | Parulidae | 6 | 2024 | +200% | 1996 | |
| Red Crossbill | Fringillidae | 6 | 2022 | -47% | 2003 | |
| Cassin's Finch | Fringillidae | 5 | 2024 | -63% | 1994 | |
| Hermit Thrush | Turdidae | 5 | 2024 | -7% | 1996 | |
| Western Bluebird | Turdidae | 5 | 1992 | +25% | 1991 | |
| Fox Sparrow | Passerellidae | 5 | 2024 | +433% | 2010 | |
| Cinnamon Teal | Anatidae | 5 | 2021 | n/a | n/a | |
| Mourning Dove | Columbidae | 4 | 2024 | -73% | 1992 | |
| Violet-green Swallow | Hirundinidae | 4 | 2024 | -82% | 1992 | |
| Horned Lark | Alaudidae | 4 | 1991 | n/a | n/a | |
| Black-capped Chickadee | Paridae | 4 | 2024 | -10% | 1996 | |
| Dusky Flycatcher | Tyrannidae | 4 | 2024 | -15% | 1998 | |
| Bullock's Oriole | Icteridae | 4 | 2023 | +200% | 2001 | |
| Killdeer | Charadriidae | 3 | 2023 | -86% | 1992 |
Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22. A route is a sample, not a census.