Guild · Colorado · BBS 2025 Release · 1966–2024
Grassland Birds In Colorado
14 species in this guild. As a group they are -64% since 1970.
Guild Signals
guild collapsecomputed index
Grassland birds as a group have fallen sharply in Colorado, down 64% since 1970.
Forecast
If the recent trend holds, Grassland birds in Colorado is projected to fall about 46% by 2029 — from 11 in 2024 to a central estimate of 5.7 (95% range 0.00–15). A 5-year backtest shows a typical error of ±32.2%, with 100% of held-out values landing inside the 95% band.
-46%Change by 2029
5.7Projected 2029 index
0.00–1595% range
±32.2%Backtest error
| Year | Projected index | 95% low | 95% high |
|---|---|---|---|
| 2025 | 7.5 | 0.00 | 17 |
| 2026 | 7.1 | 0.00 | 17 |
| 2027 | 6.6 | 0.00 | 16 |
| 2028 | 6.2 | 0.00 | 16 |
| 2029 | 5.7 | 0.00 | 15 |
Member Species In Colorado
| Ring-necked Pheasant | Phasianidae | -95% |
| Upland Sandpiper | Scolopacidae | -94% |
| Lark Bunting | Passerellidae | -86% |
| Bobolink | Icteridae | -80% |
| Northern Bobwhite | Odontophoridae | -75% |
| Grasshopper Sparrow | Passerellidae | -63% |
| Horned Lark | Alaudidae | -50% |
| Western Meadowlark | Icteridae | -47% |
| Savannah Sparrow | Passerellidae | +49% |
| Greater Prairie-Chicken | Phasianidae | +81% |
| Lark Sparrow | Passerellidae | +207% |
| Cassin's Sparrow | Passerellidae | +215% |
| Dickcissel | Cardinalidae | +434% |
| Vesper Sparrow | Passerellidae | 19× |
Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.