Guild · Colorado · BBS 2025 Release · 1966–2024
Aerial Insectivores In Colorado
23 species in this guild. As a group they are -24% since 1970.
Guild Signals
No notable trend signals for aerial insectivores in Colorado. See the full index history below.
Forecast
If the recent trend holds, Aerial insectivores in Colorado is projected to stay roughly flat through 2029, near 2.7 (95% range 1.4–3.9). A 5-year backtest shows a typical error of ±25.8%, with 100% of held-out values landing inside the 95% band.
+9%Change by 2029
2.7Projected 2029 index
1.4–3.995% range
±25.8%Backtest error
| Year | Projected index | 95% low | 95% high |
|---|---|---|---|
| 2025 | 2.8 | 1.5 | 4.0 |
| 2026 | 2.7 | 1.5 | 4.0 |
| 2027 | 2.7 | 1.5 | 4.0 |
| 2028 | 2.7 | 1.4 | 4.0 |
| 2029 | 2.7 | 1.4 | 3.9 |
Member Species In Colorado
| Chimney Swift | Apodidae | -82% |
| Eastern Kingbird | Tyrannidae | -75% |
| Willow Flycatcher | Tyrannidae | -61% |
| Bank Swallow | Hirundinidae | -54% |
| Barn Swallow | Hirundinidae | -47% |
| Northern Rough-winged Swallow | Hirundinidae | -43% |
| Olive-sided Flycatcher | Tyrannidae | -40% |
| Cliff Swallow | Hirundinidae | -32% |
| Common Poorwill | Caprimulgidae | -16% |
| Eastern Phoebe | Tyrannidae | -9% |
| Cassin's Kingbird | Tyrannidae | -8% |
| Western Kingbird | Tyrannidae | -7% |
| Purple Martin | Hirundinidae | +15% |
| Western Wood-Pewee | Tyrannidae | +25% |
| Say's Phoebe | Tyrannidae | +30% |
| Tree Swallow | Hirundinidae | +40% |
| Violet-green Swallow | Hirundinidae | +46% |
| Common Nighthawk | Caprimulgidae | +83% |
| White-throated Swift | Apodidae | +244% |
| Hammond's Flycatcher | Tyrannidae | +390% |
| Gray Flycatcher | Tyrannidae | +435% |
| Dusky Flycatcher | Tyrannidae | +557% |
| Ash-throated Flycatcher | Tyrannidae | +839% |
Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.