BBS Route · Colorado · BCR 16
Rollins Pass Bird Survey Route
A standard 50-stop Breeding Bird Survey route. 74 species recorded across 21 survey years, still active.
74Species Recorded
21Years Surveyed
1998–2022Span
3Observers
Bird Species Found on Colorado Rollins Pass
Top 40 of 74 species by most recent count. Each links to its species trend.
| History | ||||||
|---|---|---|---|---|---|---|
| Ruby-crowned Kinglet | Regulidae | 23 | 2022 | -42% | 2001 | |
| Hermit Thrush | Turdidae | 22 | 2022 | -35% | 2001 | |
| Red Crossbill | Fringillidae | 21 | 2022 | +429% | 2003 | |
| Broad-tailed Hummingbird | Trochilidae | 15 | 2022 | -2% | 2001 | |
| American Robin | Turdidae | 12 | 2022 | -11% | 2001 | |
| Violet-green Swallow | Hirundinidae | 10 | 2022 | +517% | 2002 | |
| Brewer's Blackbird | Icteridae | 9 | 2014 | +800% | 2008 | |
| Tree Swallow | Hirundinidae | 7 | 2019 | -49% | 2001 | |
| Warbling Vireo | Vireonidae | 7 | 2022 | -30% | 2001 | |
| Steller's Jay | Corvidae | 6 | 2021 | +114% | 2003 | |
| Lincoln's Sparrow | Passerellidae | 6 | 2022 | -79% | 2001 | |
| Mountain Chickadee | Paridae | 6 | 2022 | -74% | 2001 | |
| Common Raven | Corvidae | 5 | 2022 | +15% | 2001 | |
| Clark's Nutcracker | Corvidae | 5 | 2022 | -46% | 2001 | |
| White-crowned Sparrow | Passerellidae | 5 | 2022 | -71% | 2001 | |
| Black-billed Magpie | Corvidae | 4 | 2021 | +114% | 2007 | |
| Pine Siskin | Fringillidae | 4 | 2022 | -80% | 2001 | |
| Northern House Wren | Troglodytidae | 4 | 2021 | +0% | 2002 | |
| Mourning Dove | Columbidae | 4 | 2007 | +100% | 2002 | |
| Canada Goose | Anatidae | 4 | 2010 | n/a | n/a | |
| Band-tailed Pigeon | Columbidae | 3 | 2001 | n/a | n/a | |
| Brown-headed Cowbird | Icteridae | 2 | 2022 | +67% | 2001 | |
| Savannah Sparrow | Passerellidae | 2 | 1998 | n/a | n/a | |
| MacGillivray's Warbler | Parulidae | 2 | 2022 | +38% | 2001 | |
| Golden-crowned Kinglet | Regulidae | 2 | 2015 | +167% | 2003 | |
| Mountain Bluebird | Turdidae | 2 | 2021 | +400% | 2002 | |
| Canada Jay | Corvidae | 2 | 2011 | +0% | 1999 | |
| Cassin's Finch | Fringillidae | 2 | 2021 | +33% | 2002 | |
| Olive-sided Flycatcher | Tyrannidae | 2 | 2022 | +50% | 2006 | |
| Dusky Flycatcher | Tyrannidae | 2 | 2022 | -14% | 2004 | |
| Vesper Sparrow | Passerellidae | 2 | 2021 | +75% | 2008 | |
| Black-headed Grosbeak | Cardinalidae | 2 | 2022 | +0% | 2012 | |
| Hairy Woodpecker | Picidae | 2 | 2022 | +0% | 2014 | |
| Red-naped Sapsucker | Picidae | 2 | 2022 | +0% | 2015 | |
| Spotted Towhee | Passerellidae | 2 | 2021 | +100% | 2019 | |
| Mallard | Anatidae | 1 | 1998 | n/a | n/a | |
| Wilson's Snipe | Scolopacidae | 1 | 2006 | +0% | 1998 | |
| Western Wood-Pewee | Tyrannidae | 1 | 2022 | -67% | 2001 | |
| Pine Grosbeak | Fringillidae | 1 | 2018 | -33% | 2004 | |
| Chipping Sparrow | Passerellidae | 1 | 2022 | -57% | 2001 |
Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22. A route is a sample, not a census.