BBS Route · Colorado · BCR 18
Nunn Bird Survey Route
A standard 50-stop Breeding Bird Survey route. 87 species recorded across 26 survey years, still active.
87Species Recorded
26Years Surveyed
1995–2021Span
2Observers
Bird Species Found on Colorado Nunn
Top 40 of 87 species by most recent count. Each links to its species trend.
| History | ||||||
|---|---|---|---|---|---|---|
| Lark Bunting | Passerellidae | 262 | 2021 | +73% | 1997 | |
| Horned Lark | Alaudidae | 202 | 2021 | +65% | 1997 | |
| Western Meadowlark | Icteridae | 162 | 2021 | +163% | 1997 | |
| House Sparrow | Passeridae | 112 | 2021 | +418% | 1997 | |
| Mourning Dove | Columbidae | 66 | 2021 | +94% | 1997 | |
| European Starling | Sturnidae | 62 | 2021 | +347% | 1997 | |
| Common Grackle | Icteridae | 52 | 2021 | +235% | 1997 | |
| Eurasian Collared-Dove | Columbidae | 46 | 2021 | +715% | 2008 | |
| Red-winged Blackbird | Icteridae | 38 | 2021 | +187% | 1997 | |
| Western Kingbird | Tyrannidae | 29 | 2021 | +439% | 1997 | |
| Wilson's Phalarope | Scolopacidae | 29 | 2014 | +625% | 2010 | |
| Thick-billed Longspur | Calcariidae | 20 | 2021 | -28% | 1997 | |
| Grasshopper Sparrow | Passerellidae | 19 | 2021 | +338% | 1997 | |
| Killdeer | Charadriidae | 15 | 2021 | -8% | 1997 | |
| Swainson's Hawk | Accipitridae | 15 | 2021 | +236% | 1997 | |
| American Robin | Turdidae | 14 | 2021 | +174% | 1997 | |
| Brewer's Sparrow | Passerellidae | 12 | 2021 | -23% | 1997 | |
| Northern Shoveler | Anatidae | 12 | 2008 | n/a | n/a | |
| Rock Pigeon | Columbidae | 11 | 2021 | +76% | 2000 | |
| Ruddy Duck | Anatidae | 8 | 2017 | +700% | 2015 | |
| Red-tailed Hawk | Accipitridae | 7 | 2021 | +300% | 2002 | |
| Mallard | Anatidae | 6 | 2021 | -41% | 1997 | |
| Chestnut-collared Longspur | Calcariidae | 6 | 2021 | +880% | 1997 | |
| Brewer's Blackbird | Icteridae | 6 | 2006 | -9% | 1998 | |
| Barn Swallow | Hirundinidae | 5 | 2021 | +81% | 1997 | |
| House Finch | Fringillidae | 5 | 2021 | +100% | 2010 | |
| Canada Goose | Anatidae | 5 | 2021 | +191% | 2001 | |
| Lesser Scaup | Anatidae | 5 | 2019 | n/a | n/a | |
| Western Grebe | Podicipedidae | 4 | 2017 | +175% | 2002 | |
| American Avocet | Recurvirostridae | 4 | 2021 | -44% | 2008 | |
| Cliff Swallow | Hirundinidae | 4 | 2018 | +17% | 2002 | |
| Gadwall | Anatidae | 4 | 2018 | -64% | 2009 | |
| Ferruginous Hawk | Accipitridae | 3 | 2018 | +150% | 1998 | |
| Brown-headed Cowbird | Icteridae | 3 | 2021 | +483% | 1997 | |
| Lark Sparrow | Passerellidae | 3 | 2019 | +150% | 1998 | |
| Eastern Kingbird | Tyrannidae | 3 | 2019 | -20% | 1999 | |
| Burrowing Owl | Strigidae | 3 | 2019 | -46% | 2010 | |
| Northern Mockingbird | Mimidae | 3 | 2021 | +0% | 2009 | |
| Green-winged Teal | Anatidae | 3 | 2017 | +50% | 2013 | |
| American White Pelican | Pelecanidae | 2 | 2018 | +53% | 2006 |
Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22. A route is a sample, not a census.