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

Generalists In South Carolina

All statesSouth Carolina

12 species in this guild. As a group they are -63%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 1968.

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 South Carolina, down 63% since 1968.

Generalists In South Carolina Population Forecast

If the recent trend holds, Generalists in South Carolina is projected to fall about 39% by 2030 — from 10 in 2025 to a central estimate of 6.4 (95% range 1.5–11). A 5-year backtest shows a typical error of ±22.4%, 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 →
6.4Projected 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 →
1.5–1195% 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 →
±22.4%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 Carolina is projected to fall about 39% by 2030 — from 10 in 2025 to a central estimate of 6.4 (95% range 1.5–11). A 5-year backtest shows a typical error of ±22.4%, with 100% of held-out values landing inside the 95% band.19662030
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 →
20267.72.813
20277.42.412
20287.12.112
20296.81.812
20306.41.511

Member Species In South Carolina

Generalists species in South Carolina.
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-96%
European StarlingSturnidae-91%
Common GrackleIcteridae-88%
Rock PigeonColumbidae-75%
Common Ground DoveColumbidae-62%
Northern MockingbirdMimidae-46%
Mourning DoveColumbidae+1%
American CrowCorvidae+31%
Fish CrowCorvidae+221%
Eurasian Collared-DoveColumbidae+544%
Brown-headed CowbirdIcteridae+557%
House FinchFringillidae12×

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