BirdAnalyst
Guild · South Dakota · BBS 2026 Release · 1966–2025

Generalists In South Dakota

All statesSouth Dakota

12 species in this guild. As a group they are -29%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 South Dakota. See the full index history below.

Generalists In South Dakota Population Forecast

If the recent trend holds, Generalists in South Dakota is projected to fall about 39% by 2030 — from 16 in 2025 to a central estimate of 9.6 (95% range 0.00–20). A 5-year backtest shows a typical error of ±29.9%, with 100% of held-out values landing inside the 95% band.

-39%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 →
9.6Projected 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 →
0.00–2095% 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 →
±29.9%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 South Dakota is projected to fall about 39% by 2030 — from 16 in 2025 to a central estimate of 9.6 (95% range 0.00–20). A 5-year backtest shows a typical error of ±29.9%, with 100% 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 →
2026110.1321
2027100.0021
2028100.0020
20299.80.0020
20309.60.0020

Member Species In South Dakota

Generalists species in South Dakota.
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-57%
Common GrackleIcteridae-48%
Northern MockingbirdMimidae-47%
Black-billed MagpieCorvidae-3%
Mourning DoveColumbidae+3%
American CrowCorvidae+4%
European StarlingSturnidae+12%
House FinchFringillidae+21%
Rock PigeonColumbidae+40%
Brown-headed CowbirdIcteridae+46%
Brewer's BlackbirdIcteridae+351%
Eurasian Collared-DoveColumbidae23×

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