Guild · Maine · BBS 2025 Release · 1966–2024
Aerial Insectivores In Maine
18 species in this guild. As a group they are -74% since 1968.
Guild Signals
guild collapsecomputed index
Aerial insectivores as a group have fallen sharply in Maine, down 74% since 1968.
Forecast
If the recent trend holds, Aerial insectivores in Maine is projected to fall about 100% by 2029 — from 2.4 in 2024 to a central estimate of 0.00 (95% range 0.00–1.7). A 5-year backtest shows a typical error of ±87.7%, with 40% of held-out values landing inside the 95% band.
-100%Change by 2029
0.00Projected 2029 index
0.00–1.795% range
±87.7%Backtest error
| Year | Projected index | 95% low | 95% high |
|---|---|---|---|
| 2025 | 0.43 | 0.00 | 2.1 |
| 2026 | 0.32 | 0.00 | 2.0 |
| 2027 | 0.20 | 0.00 | 1.9 |
| 2028 | 0.09 | 0.00 | 1.8 |
| 2029 | 0.00 | 0.00 | 1.7 |
Member Species In Maine
| Cliff Swallow | Hirundinidae | -95% |
| Bank Swallow | Hirundinidae | -92% |
| Northern Rough-winged Swallow | Hirundinidae | -92% |
| Olive-sided Flycatcher | Tyrannidae | -90% |
| Barn Swallow | Hirundinidae | -90% |
| Yellow-bellied Flycatcher | Tyrannidae | -89% |
| Tree Swallow | Hirundinidae | -87% |
| Eastern Whip-poor-will | Caprimulgidae | -86% |
| Willow Flycatcher | Tyrannidae | -80% |
| Eastern Kingbird | Tyrannidae | -77% |
| Least Flycatcher | Tyrannidae | -60% |
| Purple Martin | Hirundinidae | -60% |
| Chimney Swift | Apodidae | -56% |
| Common Nighthawk | Caprimulgidae | -54% |
| Alder Flycatcher | Tyrannidae | -45% |
| Eastern Wood-Pewee | Tyrannidae | -38% |
| Eastern Phoebe | Tyrannidae | +101% |
| Great Crested Flycatcher | Tyrannidae | +136% |
Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.