Guild · California · BBS 2025 Release · 1966–2024
Wetland Birds In California
33 species in this guild. As a group they are +22% since 1970.
Guild Signals
No notable trend signals for wetland birds in California. See the full index history below.
Forecast
If the recent trend holds, Wetland birds in California is projected to rise about 117% by 2029 — from 0.71 in 2024 to a central estimate of 1.5 (95% range 0.51–2.6). A 5-year backtest shows a typical error of ±198.5%, with 20% of held-out values landing inside the 95% band.
+117%Change by 2029
1.5Projected 2029 index
0.51–2.695% range
±198.5%Backtest error
| Year | Projected index | 95% low | 95% high |
|---|---|---|---|
| 2025 | 1.5 | 0.47 | 2.5 |
| 2026 | 1.5 | 0.48 | 2.5 |
| 2027 | 1.5 | 0.49 | 2.5 |
| 2028 | 1.5 | 0.50 | 2.5 |
| 2029 | 1.5 | 0.51 | 2.6 |
Member Species In California
| Heermann's Gull | Laridae | -95% |
| Western Gull | Laridae | -84% |
| Common Gallinule | Rallidae | -82% |
| Western Grebe | Podicipedidae | -80% |
| Black Tern | Laridae | -77% |
| Pelagic Cormorant | Phalacrocoracidae | -74% |
| Forster's Tern | Laridae | -60% |
| Clark's Grebe | Podicipedidae | -34% |
| American Bittern | Ardeidae | -34% |
| Caspian Tern | Laridae | -33% |
| Ridgway's Rail | Rallidae | -30% |
| Glaucous-winged Gull | Laridae | -26% |
| Green Heron | Ardeidae | -10% |
| Pied-billed Grebe | Podicipedidae | +3% |
| Ring-billed Gull | Laridae | +8% |
| Great Blue Heron | Ardeidae | +19% |
| American Coot | Rallidae | +23% |
| California Gull | Laridae | +26% |
| Least Tern | Laridae | +26% |
| Franklin's Gull | Laridae | +45% |
| Sandhill Crane | Gruidae | +51% |
| Virginia Rail | Rallidae | +64% |
| Double-crested Cormorant | Phalacrocoracidae | +69% |
| Eared Grebe | Podicipedidae | +83% |
| Sora | Rallidae | +94% |
| Snowy Egret | Ardeidae | +95% |
| Brandt's Cormorant | Phalacrocoracidae | +109% |
| Western Cattle-Egret | Ardeidae | +116% |
| Black-crowned Night Heron | Ardeidae | +152% |
| American White Pelican | Pelecanidae | +213% |
| Brown Pelican | Pelecanidae | +525% |
| White-faced Ibis | Threskiornithidae | 24× |
| Great Egret | Ardeidae | 43× |
Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.