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

Generalists In Idaho

All statesIdaho

12 species in this guild. As a group they are -67%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 1970.

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 Idaho, down 67% since 1970.

Generalists In Idaho Population Forecast

If the recent trend holds, Generalists in Idaho is projected to fall about 66% by 2030 — from 10.0 in 2025 to a central estimate of 3.4 (95% range 0.00–13). A 5-year backtest shows a typical error of ±55.7%, with 100% of held-out values landing inside the 95% band.

-66%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 →
3.4Projected 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 →
0.00–1395% 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 →
±55.7%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 Idaho is projected to fall about 66% by 2030 — from 10.0 in 2025 to a central estimate of 3.4 (95% range 0.00–13). A 5-year backtest shows a typical error of ±55.7%, with 100% of held-out values landing inside the 95% band.19682030
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 →
20264.70.0015
20274.40.0014
20284.00.0014
20293.70.0014
20303.40.0013

Member Species In Idaho

Generalists species in Idaho.
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 →
Brewer's BlackbirdIcteridae-83%
Black-billed MagpieCorvidae-69%
House SparrowPasseridae-68%
European StarlingSturnidae-66%
Mourning DoveColumbidae-55%
Brown-headed CowbirdIcteridae-16%
House FinchFringillidae-14%
American CrowCorvidae-3%
Common GrackleIcteridae+4%
Rock PigeonColumbidae+27%
Common RavenCorvidae+275%
Eurasian Collared-DoveColumbidae+680%

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