Guild · Maryland · BBS 2025 Release · 1966–2024
Wetland Birds In Maryland
21 species in this guild. As a group they are -25% since 1968.
Guild Signals
No notable trend signals for wetland birds in Maryland. See the full index history below.
Forecast
If the recent trend holds, Wetland birds in Maryland is projected to rise about 173% by 2029 — from 0.47 in 2024 to a central estimate of 1.3 (95% range 0.13–2.5). A 5-year backtest shows a typical error of ±93%, with 100% of held-out values landing inside the 95% band.
+173%Change by 2029
1.3Projected 2029 index
0.13–2.595% range
±93%Backtest error
| Year | Projected index | 95% low | 95% high |
|---|---|---|---|
| 2025 | 1.3 | 0.11 | 2.5 |
| 2026 | 1.3 | 0.11 | 2.5 |
| 2027 | 1.3 | 0.12 | 2.5 |
| 2028 | 1.3 | 0.12 | 2.5 |
| 2029 | 1.3 | 0.13 | 2.5 |
Member Species In Maryland
| Western Cattle-Egret | Ardeidae | -83% |
| Black-crowned Night Heron | Ardeidae | -75% |
| Forster's Tern | Laridae | -62% |
| Common Tern | Laridae | -54% |
| Green Heron | Ardeidae | -45% |
| Laughing Gull | Laridae | -38% |
| Least Tern | Laridae | -34% |
| Common Gallinule | Rallidae | -27% |
| Little Blue Heron | Ardeidae | -19% |
| Great Black-backed Gull | Laridae | +6% |
| Virginia Rail | Rallidae | +51% |
| King Rail | Rallidae | +85% |
| Snowy Egret | Ardeidae | +93% |
| Great Blue Heron | Ardeidae | +99% |
| Great Egret | Ardeidae | +117% |
| Herring Gull | Laridae | +119% |
| Least Bittern | Ardeidae | +182% |
| Double-crested Cormorant | Phalacrocoracidae | +683% |
| Glossy Ibis | Threskiornithidae | +804% |
| Ring-billed Gull | Laridae | 11× |
| Clapper Rail | Rallidae | 14× |
Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.