Guild · Arizona · BBS 2025 Release · 1966–2024
Generalists In Arizona
96 species in this guild. As a group they are -53% since 1970.
Guild Signals
guild collapsecomputed index
Generalists as a group have fallen sharply in Arizona, down 53% since 1970.
Forecast
If the recent trend holds, Generalists in Arizona is projected to fall about 16% by 2029 — from 2.4 in 2024 to a central estimate of 2.0 (95% range 0.21–3.9). A 5-year backtest shows a typical error of ±9.6%, with 100% of held-out values landing inside the 95% band.
-16%Change by 2029
2.0Projected 2029 index
0.21–3.995% range
±9.6%Backtest error
| Year | Projected index | 95% low | 95% high |
|---|---|---|---|
| 2025 | 2.3 | 0.43 | 4.1 |
| 2026 | 2.2 | 0.38 | 4.0 |
| 2027 | 2.1 | 0.32 | 4.0 |
| 2028 | 2.1 | 0.27 | 3.9 |
| 2029 | 2.0 | 0.21 | 3.9 |
Member Species In Arizona
Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.