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

Generalists In California

All statesCalifornia

108 species in this guild. As a group they are -34%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 California. See the full index history below.

Generalists In California Population Forecast

If the recent trend holds, Generalists in California is projected to fall about 23% by 2029 — from 4.2 in 2024 to a central estimate of 3.3 (95% range 2.3–4.2). A 5-year backtest shows a typical error of ±10.5%, with 100% 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 →
3.3Projected 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 →
2.3–4.295% 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 →
±10.5%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 California is projected to fall about 23% by 2029 — from 4.2 in 2024 to a central estimate of 3.3 (95% range 2.3–4.2). A 5-year backtest shows a typical error of ±10.5%, with 100% 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 →
20253.42.54.4
20263.42.44.4
20273.42.44.3
20283.32.44.3
20293.32.34.2

Member Species In California

Generalists species in California.
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 MurreAlcidae-98%
LeConte's ThrasherMimidae-97%
Loggerhead ShrikeLaniidae-88%
Bendire's ThrasherMimidae-88%
Pigeon GuillemotAlcidae-87%
Spotted DoveColumbidae-86%
Scott's OrioleIcteridae-86%
Burrowing OwlStrigidae-85%
White-tailed KiteAccipitridae-81%
Common Ground DoveColumbidae-73%
Northern HarrierAccipitridae-71%
American KestrelFalconidae-71%
Brewer's BlackbirdIcteridae-70%
Black-chinned SparrowPasserellidae-68%
Clark's NutcrackerCorvidae-64%
Spotted OwlStrigidae-62%
White-crowned SparrowPasserellidae-62%
Sagebrush SparrowPasserellidae-62%
Tricolored BlackbirdIcteridae-58%
Chipping SparrowPasserellidae-57%
Sharp-shinned HawkAccipitridae-57%
House SparrowPasseridae-55%
Black-chinned HummingbirdTrochilidae-52%
Cassin's FinchFringillidae-50%
BushtitAegithalidae-49%
Evening GrosbeakFringillidae-49%
Lincoln's SparrowPasserellidae-46%
American Barn OwlTytonidae-45%
Golden EagleAccipitridae-44%
Bullock's OrioleIcteridae-44%
Calliope HummingbirdTrochilidae-43%
Canada JayCorvidae-42%
Pine SiskinFringillidae-42%
Yellow-billed MagpieCorvidae-40%
Yellow-headed BlackbirdIcteridae-39%
American GoshawkAccipitridae-37%
Northern Pygmy-OwlStrigidae-36%
House FinchFringillidae-35%
Pine GrosbeakFringillidae-35%
Cedar WaxwingBombycillidae-35%
American DipperCinclidae-32%
Allen's HummingbirdTrochilidae-27%
Purple FinchFringillidae-23%
WrentitSylviidae-22%
Summer TanagerCardinalidae-22%
Indigo BuntingCardinalidae-22%
Broad-tailed HummingbirdTrochilidae-21%
Bell's SparrowPasserellidae-21%
Mourning DoveColumbidae-19%
California Scrub-JayCorvidae-17%
Belted KingfisherAlcedinidae-13%
American GoldfinchFringillidae-10%
Lawrence's GoldfinchFringillidae-9%
Woodhouse's Scrub-JayCorvidae-8%
Black-headed GrosbeakCardinalidae-8%
Red-winged BlackbirdIcteridae-5%
California ThrasherMimidae-4%
Yellow-breasted ChatIcteriidae-3%
California TowheePasserellidae-1%
Crissal ThrasherMimidae+0%
Costa's HummingbirdTrochilidae+6%
Lazuli BuntingCardinalidae+7%
Steller's JayCorvidae+9%
California QuailOdontophoridae+11%
Cooper's HawkAccipitridae+11%
Marbled MurreletAlcidae+14%
Blue GrosbeakCardinalidae+16%
Prairie FalconFalconidae+17%
Peregrine FalconFalconidae+17%
Northern MockingbirdMimidae+18%
Western Screech-OwlStrigidae+24%
Spotted TowheePasserellidae+26%
Rufous HummingbirdTrochilidae+27%
Song SparrowPasserellidae+29%
Red-tailed HawkAccipitridae+32%
European StarlingSturnidae+34%
Brown-headed CowbirdIcteridae+35%
Lesser GoldfinchFringillidae+38%
Rock PigeonColumbidae+39%
American CrowCorvidae+40%
Mountain QuailOdontophoridae+49%
Sooty GrousePhasianidae+62%
Band-tailed PigeonColumbidae+66%
Short-eared OwlStrigidae+74%
Western TanagerCardinalidae+74%
Common RavenCorvidae+81%
Pinyon JayCorvidae+84%
Turkey VultureCathartidae+85%
Black-billed MagpieCorvidae+101%
White-winged DoveColumbidae+105%
Green-tailed TowheePasserellidae+110%
OspreyPandionidae+117%
Red CrossbillFringillidae+126%
Brewer's SparrowPasserellidae+138%
Anna's HummingbirdTrochilidae+145%
Great Horned OwlStrigidae+193%
Fox SparrowPasserellidae+233%
Sage ThrasherMimidae+286%
Hooded OrioleIcteridae+368%
Greater Sage-GrousePhasianidae+397%
Rufous-crowned SparrowPasserellidae+486%
Red-shouldered HawkAccipitridae+521%
ChukarPhasianidae+548%
Bald EagleAccipitridae+895%
Swainson's HawkAccipitridae24×
Wild TurkeyPhasianidae37×
Great-tailed GrackleIcteridae46×
Eurasian Collared-DoveColumbidae95×

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