Guild
Grassland Birds
29 species tracked. As a group, grassland birds are -52%Guild trendA mean-index aggregate across the species in this group — the structural direction of the guild, with individual-species noise smoothed out.Full methodology → since 1968.
Guild SignalsNotable signalsLong-arc shifts the engine flags automatically — sustained declines or increases large enough to stand out from year-to-year noise.Full methodology →
guild collapsecomputed indexTrend sourceWhether the figure is our own computed route-weighted index or an official USGS modeled estimate. The current build labels every trend as computed.Full methodology →
Grassland birds as a group have fallen sharply in surveyed states, down 52% since 1968.
Grassland Birds Population Forecast
If the recent trend holds, Grassland birds as a group is projected to fall about 31% by 2029 — from 2.2 in 2024 to a central estimate of 1.5 (95% range 1.0–2.0). A 5-year backtest shows a typical error of ±15.6%, with 80% of held-out values landing inside the 95% band.
Grassland Birds By State
| Guild trendA mean-index aggregate across the species in this group — the structural direction of the guild, with individual-species noise smoothed out.Full methodology → | ||
|---|---|---|
| Georgia | -92% | 5 |
| South Carolina | -91% | 5 |
| New Jersey | -91% | 6 |
| Connecticut | -86% | 3 |
| North Carolina | -85% | 7 |
| Alabama | -85% | 6 |
| Louisiana | -84% | 5 |
| West Virginia | -83% | 7 |
| Wisconsin | -81% | 15 |
| Michigan | -80% | 14 |
| Tennessee | -79% | 6 |
| Kentucky | -76% | 9 |
| Mississippi | -73% | 6 |
| California | -73% | 7 |
| Maryland | -73% | 8 |
| Pennsylvania | -72% | 8 |
| Arizona | -69% | 9 |
| Iowa | -67% | 13 |
| Indiana | -67% | 13 |
| Colorado | -67% | 15 |
| Illinois | -66% | 13 |
| Maine | -66% | 6 |
| Virginia | -65% | 8 |
| Ohio | -65% | 12 |
| Vermont | -64% | 6 |
| Wyoming | -56% | 16 |
| New York | -55% | 9 |
| Minnesota | -53% | 15 |
| Missouri | -52% | 12 |
| New Hampshire | -52% | 4 |
| North Dakota | -48% | 18 |
| Texas | -47% | 12 |
| Arkansas | -47% | 6 |
| Massachusetts | -46% | 4 |
| South Dakota | -44% | 17 |
| New Mexico | -43% | 11 |
| Idaho | -36% | 9 |
| Kansas | -32% | 14 |
| Nebraska | -26% | 16 |
| Oregon | -23% | 8 |
| Nevada | -22% | 7 |
| Washington | -21% | 8 |
| Montana | -13% | 16 |
| Alaska | +3% | 9 |
| Delaware | +4% | 4 |
| Utah | +5% | 9 |
| Oklahoma | +21% | 11 |