Guild · California · BBS 2025 Release · 1966–2024
Generalists In California
108 species in this guild. As a group they are -34% since 1970.
Guild Signals
No notable trend signals for generalists in California. See the full index history below.
Forecast
If the recent trend holds, Generalists in California is projected to fall about 23% by 2029 — from 4.2 in 2024 to a central estimate of 3.3 (95% range 2.3–4.2). A 5-year backtest shows a typical error of ±10.5%, with 100% of held-out values landing inside the 95% band.
-23%Change by 2029
3.3Projected 2029 index
2.3–4.295% range
±10.5%Backtest error
| Year | Projected index | 95% low | 95% high |
|---|---|---|---|
| 2025 | 3.4 | 2.5 | 4.4 |
| 2026 | 3.4 | 2.4 | 4.4 |
| 2027 | 3.4 | 2.4 | 4.3 |
| 2028 | 3.3 | 2.4 | 4.3 |
| 2029 | 3.3 | 2.3 | 4.2 |
Member Species In California
Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.