Guild · Colorado · BBS 2025 Release · 1966–2024
Wetland Birds In Colorado
18 species in this guild. As a group they are +166% since 1970.
Guild Signals
No notable trend signals for wetland birds in Colorado. See the full index history below.
Forecast
If the recent trend holds, Wetland birds in Colorado is projected to fall about 22% by 2029 — from 1.1 in 2024 to a central estimate of 0.88 (95% range 0.31–1.5). A 5-year backtest shows a typical error of ±47.6%, with 20% of held-out values landing inside the 95% band.
-22%Change by 2029
0.88Projected 2029 index
0.31–1.595% range
±47.6%Backtest error
| Year | Projected index | 95% low | 95% high |
|---|---|---|---|
| 2025 | 0.83 | 0.26 | 1.4 |
| 2026 | 0.84 | 0.27 | 1.4 |
| 2027 | 0.85 | 0.28 | 1.4 |
| 2028 | 0.87 | 0.29 | 1.4 |
| 2029 | 0.88 | 0.31 | 1.5 |
Member Species In Colorado
| Black-crowned Night Heron | Ardeidae | -94% |
| White-faced Ibis | Threskiornithidae | -94% |
| American Bittern | Ardeidae | -81% |
| Forster's Tern | Laridae | -77% |
| Virginia Rail | Rallidae | -73% |
| Snowy Egret | Ardeidae | -65% |
| Pied-billed Grebe | Podicipedidae | -27% |
| American Coot | Rallidae | -7% |
| Black Tern | Laridae | -6% |
| Western Grebe | Podicipedidae | +3% |
| Eared Grebe | Podicipedidae | +15% |
| Ring-billed Gull | Laridae | +59% |
| Sora | Rallidae | +77% |
| Sandhill Crane | Gruidae | +165% |
| Great Blue Heron | Ardeidae | +219% |
| Double-crested Cormorant | Phalacrocoracidae | 19× |
| American White Pelican | Pelecanidae | 33× |
| California Gull | Laridae | 148× |
Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.