Guild · Maine · BBS 2025 Release · 1966–2024
Wetland Birds In Maine
12 species in this guild. As a group they are -74% since 1968.
Guild Signals
guild collapsecomputed index
Wetland birds as a group have fallen sharply in Maine, down 74% since 1968.
Forecast
If the recent trend holds, Wetland birds in Maine is projected to fall about 100% by 2029 — from 0.68 in 2024 to a central estimate of 0.00 (95% range 0.00–1.2). A 5-year backtest shows a typical error of ±112.4%, with 80% of held-out values landing inside the 95% band.
-100%Change by 2029
0.00Projected 2029 index
0.00–1.295% range
±112.4%Backtest error
| Year | Projected index | 95% low | 95% high |
|---|---|---|---|
| 2025 | 0.04 | 0.00 | 1.3 |
| 2026 | 0.00 | 0.00 | 1.2 |
| 2027 | 0.00 | 0.00 | 1.2 |
| 2028 | 0.00 | 0.00 | 1.2 |
| 2029 | 0.00 | 0.00 | 1.2 |
Member Species In Maine
| Herring Gull | Laridae | -88% |
| Virginia Rail | Rallidae | -83% |
| Green Heron | Ardeidae | -77% |
| American Bittern | Ardeidae | -68% |
| Black-crowned Night Heron | Ardeidae | -66% |
| Common Tern | Laridae | -62% |
| Great Blue Heron | Ardeidae | -33% |
| Double-crested Cormorant | Phalacrocoracidae | +42% |
| Pied-billed Grebe | Podicipedidae | +62% |
| Ring-billed Gull | Laridae | +73% |
| Great Black-backed Gull | Laridae | +111% |
| Common Loon | Gaviidae | +111% |
Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.