Guild · Maryland · BBS 2025 Release · 1966–2024
Grassland Birds In Maryland
10 species in this guild. As a group they are -88% since 1968.
Guild Signals
guild collapsecomputed index
Grassland birds as a group have collapsed in Maryland, down 88% since 1968.
Forecast
If the recent trend holds, Grassland birds in Maryland is projected to fall about 100% by 2029 — from 1.3 in 2024 to a central estimate of 0.00 (95% range 0.00–2.0). A 5-year backtest shows a typical error of ±182.3%, with 20% of held-out values landing inside the 95% band.
-100%Change by 2029
0.00Projected 2029 index
0.00–2.095% range
±182.3%Backtest error
| Year | Projected index | 95% low | 95% high |
|---|---|---|---|
| 2025 | 0.00 | 0.00 | 2.0 |
| 2026 | 0.00 | 0.00 | 2.0 |
| 2027 | 0.00 | 0.00 | 2.0 |
| 2028 | 0.00 | 0.00 | 2.0 |
| 2029 | 0.00 | 0.00 | 2.0 |
Member Species In Maryland
| Ring-necked Pheasant | Phasianidae | -100% |
| Northern Bobwhite | Odontophoridae | -99% |
| Vesper Sparrow | Passerellidae | -98% |
| Eastern Meadowlark | Icteridae | -86% |
| Henslow's Sparrow | Passerellidae | -66% |
| Grasshopper Sparrow | Passerellidae | -60% |
| Horned Lark | Alaudidae | -51% |
| Savannah Sparrow | Passerellidae | +86% |
| Dickcissel | Cardinalidae | +197% |
| Bobolink | Icteridae | +509% |
Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.