BBS Route · Colorado · BCR 18
Arsenal 2 Bird Survey Route
A standard 50-stop Breeding Bird Survey route. 75 species recorded across 8 survey years, still active.
75Species Recorded
8Years Surveyed
2016–2024Span
3Observers
Bird Species Found on Colorado Arsenal 2
Top 40 of 75 species by most recent count. Each links to its species trend.
| History | ||||||
|---|---|---|---|---|---|---|
| European Starling | Sturnidae | 118 | 2024 | +613% | 2018 | |
| Western Meadowlark | Icteridae | 94 | 2024 | -38% | 2018 | |
| Cliff Swallow | Hirundinidae | 84 | 2024 | +249% | 2018 | |
| Horned Lark | Alaudidae | 62 | 2024 | +467% | 2018 | |
| Lark Bunting | Passerellidae | 37 | 2024 | +153% | 2019 | |
| Mourning Dove | Columbidae | 29 | 2024 | +31% | 2018 | |
| Red-winged Blackbird | Icteridae | 26 | 2024 | -13% | 2018 | |
| Lark Sparrow | Passerellidae | 22 | 2024 | +227% | 2018 | |
| Western Kingbird | Tyrannidae | 20 | 2024 | -37% | 2018 | |
| Northern House Wren | Troglodytidae | 19 | 2024 | -29% | 2018 | |
| Common Grackle | Icteridae | 18 | 2024 | +95% | 2018 | |
| Red-tailed Hawk | Accipitridae | 17 | 2024 | +28% | 2018 | |
| Cassin's Sparrow | Passerellidae | 17 | 2024 | +180% | 2021 | |
| Bullock's Oriole | Icteridae | 15 | 2024 | -20% | 2018 | |
| Yellow-headed Blackbird | Icteridae | 13 | 2024 | +600% | 2017 | |
| American Robin | Turdidae | 12 | 2024 | +5% | 2018 | |
| Burrowing Owl | Strigidae | 10 | 2024 | +100% | 2016 | |
| American White Pelican | Pelecanidae | 9 | 2018 | +800% | 2016 | |
| Mallard | Anatidae | 9 | 2023 | +363% | 2017 | |
| Black-billed Magpie | Corvidae | 7 | 2024 | +22% | 2018 | |
| Rock Pigeon | Columbidae | 6 | 2024 | -54% | 2021 | |
| American Avocet | Recurvirostridae | 6 | 2022 | n/a | n/a | |
| Brown-headed Cowbird | Icteridae | 5 | 2024 | +83% | 2018 | |
| Yellow Warbler | Parulidae | 5 | 2024 | +39% | 2018 | |
| Swainson's Hawk | Accipitridae | 4 | 2024 | -38% | 2018 | |
| Grasshopper Sparrow | Passerellidae | 4 | 2024 | -52% | 2018 | |
| Common Yellowthroat | Parulidae | 4 | 2024 | +40% | 2021 | |
| Double-crested Cormorant | Phalacrocoracidae | 3 | 2024 | +725% | 2018 | |
| Bald Eagle | Accipitridae | 3 | 2024 | +167% | 2019 | |
| Northern Mockingbird | Mimidae | 3 | 2024 | -22% | 2021 | |
| Brewer's Blackbird | Icteridae | 3 | 2019 | n/a | n/a | |
| Northern Shoveler | Anatidae | 3 | 2022 | n/a | n/a | |
| Dickcissel | Cardinalidae | 3 | 2024 | n/a | n/a | |
| Canada Goose | Anatidae | 2 | 2024 | +50% | 2019 | |
| Killdeer | Charadriidae | 2 | 2024 | -29% | 2021 | |
| American Kestrel | Falconidae | 2 | 2024 | +75% | 2018 | |
| Say's Phoebe | Tyrannidae | 2 | 2024 | +0% | 2018 | |
| Blue Jay | Corvidae | 2 | 2024 | +67% | 2021 | |
| Vesper Sparrow | Passerellidae | 2 | 2024 | -73% | 2018 | |
| Tree Swallow | Hirundinidae | 2 | 2023 | -56% | 2018 |
Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22. A route is a sample, not a census.