Guild · Illinois · BBS 2025 Release · 1966–2024
Waterfowl In Illinois
5 species in this guild. As a group they are 12× since 1968.
Guild Signals
No notable trend signals for waterfowl in Illinois. See the full index history below.
Forecast
If the recent trend holds, Waterfowl in Illinois is projected to rise about 37% by 2029 — from 2.2 in 2024 to a central estimate of 3.0 (95% range 1.9–4.0). A 5-year backtest shows a typical error of ±27.3%, with 60% of held-out values landing inside the 95% band.
+37%Change by 2029
3.0Projected 2029 index
1.9–4.095% range
±27.3%Backtest error
| Year | Projected index | 95% low | 95% high |
|---|---|---|---|
| 2025 | 2.8 | 1.7 | 3.9 |
| 2026 | 2.8 | 1.8 | 3.9 |
| 2027 | 2.9 | 1.8 | 3.9 |
| 2028 | 2.9 | 1.9 | 4.0 |
| 2029 | 3.0 | 1.9 | 4.0 |
Member Species In Illinois
| Blue-winged Teal | Anatidae | -80% |
| Hooded Merganser | Anatidae | -77% |
| Wood Duck | Anatidae | +26% |
| Mallard | Anatidae | +249% |
| Canada Goose | Anatidae | 19× |
Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.