Guild · Illinois · BBS 2025 Release · 1966–2024
Generalists In Illinois
54 species in this guild. As a group they are -55% since 1968.
Guild Signals
guild collapsecomputed index
Generalists as a group have fallen sharply in Illinois, down 54% since 1968.
Forecast
If the recent trend holds, Generalists in Illinois is projected to fall about 26% by 2029 — from 11 in 2024 to a central estimate of 7.9 (95% range 5.0–11). A 5-year backtest shows a typical error of ±12%, with 100% of held-out values landing inside the 95% band.
-26%Change by 2029
7.9Projected 2029 index
5.0–1195% range
±12%Backtest error
| Year | Projected index | 95% low | 95% high |
|---|---|---|---|
| 2025 | 8.8 | 5.9 | 12 |
| 2026 | 8.6 | 5.7 | 11 |
| 2027 | 8.3 | 5.5 | 11 |
| 2028 | 8.1 | 5.2 | 11 |
| 2029 | 7.9 | 5.0 | 11 |
Member Species In Illinois
Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.