BirdAnalyst
Guild · Alabama · BBS 2026 Release · 1966–2025

Generalists In Alabama

All statesAlabama

13 species in this guild. As a group they are -58%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 Alabama, down 58% since 1968.

Generalists In Alabama Population Forecast

If the recent trend holds, Generalists in Alabama is projected to fall about 51% by 2030 — from 12 in 2025 to a central estimate of 6.0 (95% range 2.2–9.7). A 5-year backtest shows a typical error of ±37%, with 20% of held-out values landing inside the 95% band.

-51%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 →
6.0Projected 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 →
2.2–9.795% 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 →
±37%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 Alabama is projected to fall about 51% by 2030 — from 12 in 2025 to a central estimate of 6.0 (95% range 2.2–9.7). A 5-year backtest shows a typical error of ±37%, with 20% 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 →
20267.33.611
20277.03.211
20286.62.910
20296.32.510
20306.02.29.7

Member Species In Alabama

Generalists species in Alabama.
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 →
House SparrowPasseridae-95%
Common GrackleIcteridae-85%
Rock PigeonColumbidae-55%
Fish CrowCorvidae-53%
Northern MockingbirdMimidae-40%
European StarlingSturnidae-40%
Mourning DoveColumbidae-14%
Brown-headed CowbirdIcteridae+15%
American CrowCorvidae+20%
Common Ground DoveColumbidae+27%
White-winged DoveColumbidae22×
House FinchFringillidae47×
Eurasian Collared-DoveColumbidae69×

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