BirdAnalyst
Guild · Montana · BBS 2025 Release · 1966–2024

Generalists In Montana

All statesMontana

82 species in this guild. As a group they are -7%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 →

No notable trend signals for generalists in Montana. See the full index history below.

Generalists In Montana Population Forecast

If the recent trend holds, Generalists in Montana is projected to fall about 23% by 2029 — from 3.4 in 2024 to a central estimate of 2.6 (95% range 2.0–3.1). A 5-year backtest shows a typical error of ±20.7%, with 40% of held-out values landing inside the 95% band.

-23%Change by 2029TrendPercent 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 →
2.6Projected 2029 indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →
2.0–3.195% 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 →
±20.7%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 Montana is projected to fall about 23% by 2029 — from 3.4 in 2024 to a central estimate of 2.6 (95% range 2.0–3.1). A 5-year backtest shows a typical error of ±20.7%, with 40% of held-out values landing inside the 95% band.19682029
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 →
20252.62.13.2
20262.62.03.2
20272.62.03.2
20282.62.03.1
20292.62.03.1

Member Species In Montana

Generalists species in Montana.
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 →
Evening GrosbeakFringillidae-92%
Pinyon JayCorvidae-90%
Cooper's HawkAccipitridae-80%
Greater Sage-GrousePhasianidae-79%
American GoshawkAccipitridae-74%
Sharp-shinned HawkAccipitridae-74%
Steller's JayCorvidae-73%
Black-billed CuckooCuculidae-71%
Sage ThrasherMimidae-61%
Dusky GrousePhasianidae-61%
Black-chinned HummingbirdTrochilidae-56%
Brewer's BlackbirdIcteridae-55%
MerlinFalconidae-47%
White-winged CrossbillFringillidae-46%
Prairie FalconFalconidae-42%
Green-tailed TowheePasserellidae-37%
Canada JayCorvidae-36%
Northern Pygmy-OwlStrigidae-36%
American CrowCorvidae-36%
Brewer's SparrowPasserellidae-35%
Pine GrosbeakFringillidae-34%
Burrowing OwlStrigidae-31%
Black-billed MagpieCorvidae-31%
American KestrelFalconidae-30%
Loggerhead ShrikeLaniidae-27%
Northern MockingbirdMimidae-26%
Belted KingfisherAlcedinidae-21%
Song SparrowPasserellidae-21%
Great Horned OwlStrigidae-20%
Yellow-breasted ChatIcteriidae-20%
Pine SiskinFringillidae-18%
American DipperCinclidae-12%
Rufous HummingbirdTrochilidae-11%
Northern HarrierAccipitridae-11%
Mourning DoveColumbidae-9%
Broad-tailed HummingbirdTrochilidae-3%
Short-eared OwlStrigidae-1%
Yellow-headed BlackbirdIcteridae-1%
Baltimore OrioleIcteridae+2%
Peregrine FalconFalconidae+7%
Golden EagleAccipitridae+12%
Chipping SparrowPasserellidae+12%
Sharp-tailed GrousePhasianidae+13%
Brown ThrasherMimidae+13%
Clark's NutcrackerCorvidae+23%
Calliope HummingbirdTrochilidae+26%
Gray CatbirdMimidae+33%
American GoldfinchFringillidae+47%
Bullock's OrioleIcteridae+47%
House SparrowPasseridae+52%
Cassin's FinchFringillidae+57%
Chestnut-collared LongspurCalcariidae+66%
Red-winged BlackbirdIcteridae+67%
Gray PartridgePhasianidae+70%
White-crowned SparrowPasserellidae+70%
Turkey VultureCathartidae+105%
Lazuli BuntingCardinalidae+115%
Clay-colored SparrowPasserellidae+116%
Wild TurkeyPhasianidae+135%
European StarlingSturnidae+142%
Ruffed GrousePhasianidae+153%
Common GrackleIcteridae+178%
OspreyPandionidae+193%
Red CrossbillFringillidae+207%
Fox SparrowPasserellidae+232%
Thick-billed LongspurCalcariidae+232%
Spotted TowheePasserellidae+233%
Western TanagerCardinalidae+235%
Ferruginous HawkAccipitridae+238%
Brown-headed CowbirdIcteridae+251%
Rock PigeonColumbidae+272%
Red-tailed HawkAccipitridae+306%
Field SparrowPasserellidae+326%
Common RavenCorvidae+374%
Black-headed GrosbeakCardinalidae+390%
House FinchFringillidae+486%
Cedar WaxwingBombycillidae+560%
Swainson's HawkAccipitridae+644%
Orchard OrioleIcteridae+727%
Bald EagleAccipitridae+752%
Lincoln's SparrowPasserellidae+757%
Eurasian Collared-DoveColumbidae+913%

Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.