BirdAnalyst
Guild · West Virginia · BBS 2026 Release · 1966–2025

Generalists In West Virginia

All statesWest Virginia

11 species in this guild. As a group they are -75%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 →

Generalists as a group have fallen sharply in West Virginia, down 75% since 1968.

Generalists In West Virginia Population Forecast

If the recent trend holds, Generalists in West Virginia is projected to fall about 61% by 2030 — from 9.9 in 2025 to a central estimate of 3.9 (95% range 0.00–16). A 5-year backtest shows a typical error of ±55.6%, with 100% of held-out values landing inside the 95% band.

-61%Change by 2030TrendPercent change in the route-weighted abundance index between a smoothed baseline window and the most recent one. It tracks direction, not absolute population.Full methodology →
3.9Projected 2030 indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →
0.00–1695% range95% rangeThe 95% uncertainty band around the projection at the forecast horizon. The true value should land inside it most of the time.Full methodology →
±55.6%Backtest errorBacktest errorTypical error when we hold out the most recent years, forecast them, and compare to what actually happened. Lower means a more trustworthy projection.Full methodology →
If the recent trend holds, Generalists in West Virginia is projected to fall about 61% by 2030 — from 9.9 in 2025 to a central estimate of 3.9 (95% range 0.00–16). A 5-year backtest shows a typical error of ±55.6%, with 100% of held-out values landing inside the 95% band.19662030
Projection of the recent trend (dashed) with 80/95% bands — a projection, not a prediction. Habitat, climate, and land use are not modeled.
YearProjected indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →95% low95% rangeThe 95% uncertainty band around the projection at the forecast horizon. The true value should land inside it most of the time.Full methodology →95% high95% rangeThe 95% uncertainty band around the projection at the forecast horizon. The true value should land inside it most of the time.Full methodology →
20265.40.0017
20275.00.0017
20284.60.0017
20294.20.0016
20303.90.0016

Member Species In West Virginia

Generalists species in West Virginia.
TrendPercent change in the route-weighted abundance index between a smoothed baseline window and the most recent one. It tracks direction, not absolute population.Full methodology →
Common GrackleIcteridae-92%
House SparrowPasseridae-88%
Brown-headed CowbirdIcteridae-71%
European StarlingSturnidae-64%
Rock PigeonColumbidae-63%
Fish CrowCorvidae-32%
American CrowCorvidae-28%
Northern MockingbirdMimidae+4%
Mourning DoveColumbidae+71%
House FinchFringillidae+789%
Common RavenCorvidae18×

Source: USGS North American Breeding Bird Survey, retrieved 2026-08-14.