Guild
Grassland Birds
29 species tracked. As a group, grassland birds are -49%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 declined in surveyed states, down 49% since 1968.
Grassland Birds Population Forecast
If the recent trend holds, Grassland birds as a group is projected to fall about 34% by 2030 — from 2.3 in 2025 to a central estimate of 1.5 (95% range 1.0–2.0). A 5-year backtest shows a typical error of ±18.2%, with 60% 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 |
| North Carolina | -86% | 7 |
| West Virginia | -85% | 7 |
| Alabama | -85% | 6 |
| Connecticut | -84% | 3 |
| Louisiana | -82% | 5 |
| Wisconsin | -81% | 15 |
| Michigan | -78% | 14 |
| Tennessee | -77% | 6 |
| Mississippi | -74% | 6 |
| Kentucky | -74% | 9 |
| Maryland | -73% | 8 |
| Pennsylvania | -72% | 8 |
| California | -70% | 7 |
| Indiana | -69% | 13 |
| Iowa | -68% | 13 |
| Virginia | -67% | 8 |
| Arizona | -67% | 9 |
| Colorado | -66% | 15 |
| Maine | -66% | 6 |
| Illinois | -66% | 13 |
| Ohio | -65% | 12 |
| Wyoming | -62% | 17 |
| Vermont | -62% | 6 |
| New Hampshire | -58% | 4 |
| New York | -56% | 9 |
| Missouri | -52% | 12 |
| Minnesota | -52% | 15 |
| Arkansas | -51% | 6 |
| North Dakota | -46% | 18 |
| New Mexico | -44% | 11 |
| Texas | -44% | 12 |
| Idaho | -41% | 9 |
| South Dakota | -41% | 17 |
| Massachusetts | -38% | 4 |
| Kansas | -31% | 14 |
| Washington | -29% | 8 |
| Nevada | -20% | 7 |
| Nebraska | -20% | 16 |
| Oregon | -18% | 8 |
| Montana | -5% | 16 |
| Delaware | +3% | 4 |
| Utah | +10% | 9 |
| Alaska | +11% | 9 |
| Oklahoma | +23% | 11 |