BBS Route · Colorado · BCR 16
Willow Peak Bird Survey Route
A standard 50-stop Breeding Bird Survey route. 90 species recorded across 24 survey years, still active.
90Species Recorded
24Years Surveyed
1988–2021Span
4Observers
Bird Species Found on Colorado Willow Peak
Top 40 of 90 species by most recent count. Each links to its species trend.
| History | ||||||
|---|---|---|---|---|---|---|
| White-crowned Sparrow | Passerellidae | 32 | 2021 | -46% | 1992 | |
| American Robin | Turdidae | 28 | 2021 | -24% | 1992 | |
| Green-tailed Towhee | Passerellidae | 17 | 2021 | +55% | 1992 | |
| Ruby-crowned Kinglet | Regulidae | 14 | 2021 | -28% | 1996 | |
| Warbling Vireo | Vireonidae | 13 | 2021 | -4% | 1992 | |
| Vesper Sparrow | Passerellidae | 11 | 2021 | -35% | 1992 | |
| Lincoln's Sparrow | Passerellidae | 8 | 2021 | -55% | 1992 | |
| Clark's Nutcracker | Corvidae | 6 | 2018 | -34% | 1996 | |
| Chipping Sparrow | Passerellidae | 6 | 2018 | -6% | 1992 | |
| Western Tanager | Cardinalidae | 6 | 2021 | +50% | 1996 | |
| Ring-necked Duck | Anatidae | 6 | 2010 | -9% | 2002 | |
| Mallard | Anatidae | 5 | 2021 | -43% | 1992 | |
| Dusky Flycatcher | Tyrannidae | 5 | 2021 | -56% | 1996 | |
| Pine Grosbeak | Fringillidae | 5 | 2018 | -9% | 1992 | |
| Pine Siskin | Fringillidae | 5 | 2021 | -60% | 1992 | |
| Lazuli Bunting | Cardinalidae | 5 | 2021 | +60% | 2003 | |
| MacGillivray's Warbler | Parulidae | 5 | 2021 | +133% | 1996 | |
| Wilson's Warbler | Parulidae | 5 | 2017 | -50% | 1992 | |
| Swainson's Hawk | Accipitridae | 4 | 2021 | +20% | 1992 | |
| Horned Lark | Alaudidae | 4 | 2021 | -70% | 1992 | |
| Canada Goose | Anatidae | 4 | 2005 | n/a | n/a | |
| Lesser Scaup | Anatidae | 3 | 2018 | -59% | 1992 | |
| Western Wood-Pewee | Tyrannidae | 3 | 2018 | -54% | 1992 | |
| Common Raven | Corvidae | 3 | 2021 | +75% | 1996 | |
| Western Meadowlark | Icteridae | 3 | 2021 | -20% | 1996 | |
| Brewer's Sparrow | Passerellidae | 3 | 2021 | -54% | 1996 | |
| Spotted Towhee | Passerellidae | 3 | 2021 | -33% | 1992 | |
| Violet-green Swallow | Hirundinidae | 3 | 2018 | +14% | 1996 | |
| Black-headed Grosbeak | Cardinalidae | 3 | 2021 | +83% | 2002 | |
| Gadwall | Anatidae | 3 | 2010 | +0% | 1999 | |
| Black-billed Magpie | Corvidae | 3 | 2004 | n/a | n/a | |
| White-winged Crossbill | Fringillidae | 3 | 2018 | n/a | n/a | |
| Wilson's Snipe | Scolopacidae | 2 | 2021 | +0% | 2005 | |
| Spotted Sandpiper | Scolopacidae | 2 | 2018 | -43% | 1996 | |
| Olive-sided Flycatcher | Tyrannidae | 2 | 2018 | +133% | 1997 | |
| Savannah Sparrow | Passerellidae | 2 | 2018 | -62% | 1992 | |
| Cliff Swallow | Hirundinidae | 2 | 2012 | -91% | 1996 | |
| Tree Swallow | Hirundinidae | 2 | 2018 | -86% | 1992 | |
| Hermit Thrush | Turdidae | 2 | 2021 | -50% | 1996 | |
| Red-naped Sapsucker | Picidae | 2 | 2021 | +0% | 1999 |
Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22. A route is a sample, not a census.