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

Generalists In Nebraska

All statesNebraska

12 species in this guild. As a group they are -38%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 1969.

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 Nebraska. See the full index history below.

Generalists In Nebraska Population Forecast

If the recent trend holds, Generalists in Nebraska is projected to fall about 38% by 2030 — from 20 in 2025 to a central estimate of 12 (95% range 5.1–19). A 5-year backtest shows a typical error of ±28.5%, with 80% of held-out values landing inside the 95% band.

-38%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 →
12Projected 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 →
5.1–1995% 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 →
±28.5%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 Nebraska is projected to fall about 38% by 2030 — from 20 in 2025 to a central estimate of 12 (95% range 5.1–19). A 5-year backtest shows a typical error of ±28.5%, with 80% of held-out values landing inside the 95% band.19672030
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 →
2026146.421
2027136.120
2028135.820
2029135.520
2030125.119

Member Species In Nebraska

Generalists species in Nebraska.
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-83%
Northern MockingbirdMimidae-78%
Black-billed MagpieCorvidae-69%
Rock PigeonColumbidae-35%
American CrowCorvidae-29%
Common GrackleIcteridae-29%
Mourning DoveColumbidae+13%
Brown-headed CowbirdIcteridae+25%
Brewer's BlackbirdIcteridae+57%
European StarlingSturnidae+96%
House FinchFringillidae+872%
Eurasian Collared-DoveColumbidae113×

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