Guild · Massachusetts · BBS 2025 Release · 1966–2024
Wetland Birds In Massachusetts
13 species in this guild. As a group they are -90% since 1968.
Guild Signals
guild collapsecomputed index
Wetland birds as a group have collapsed in Massachusetts, down 90% since 1968.
Forecast
If the recent trend holds, Wetland birds in Massachusetts is projected to fall about 100% by 2029 — from 0.56 in 2024 to a central estimate of 0.00 (95% range 0.00–3.2). A 5-year backtest shows a typical error of ±345.4%, with 100% of held-out values landing inside the 95% band.
-100%Change by 2029
0.00Projected 2029 index
0.00–3.295% range
±345.4%Backtest error
| Year | Projected index | 95% low | 95% high |
|---|---|---|---|
| 2025 | 0.00 | 0.00 | 3.2 |
| 2026 | 0.00 | 0.00 | 3.2 |
| 2027 | 0.00 | 0.00 | 3.2 |
| 2028 | 0.00 | 0.00 | 3.2 |
| 2029 | 0.00 | 0.00 | 3.2 |
Member Species In Massachusetts
| Herring Gull | Laridae | -96% |
| Snowy Egret | Ardeidae | -87% |
| Ring-billed Gull | Laridae | -85% |
| Common Tern | Laridae | -75% |
| Great Black-backed Gull | Laridae | -62% |
| Least Tern | Laridae | -60% |
| Black-crowned Night Heron | Ardeidae | -39% |
| American Bittern | Ardeidae | -28% |
| Green Heron | Ardeidae | -22% |
| Laughing Gull | Laridae | -17% |
| Great Egret | Ardeidae | +41% |
| Double-crested Cormorant | Phalacrocoracidae | +100% |
| Great Blue Heron | Ardeidae | 13× |
Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.