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

Generalists In Delaware

All statesDelaware

47 species in this guild. As a group they are -10%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 →

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

Forecast

If the recent trend holds, Generalists in Delaware is projected to stay roughly flat through 2029, near 16 (95% range 11–21). A 5-year backtest shows a typical error of ±9.1%, with 100% of held-out values landing inside the 95% band.

-8%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 →
16Projected 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 →
11–2195% 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 →
±9.1%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 Delaware is projected to stay roughly flat through 2029, near 16 (95% range 11–21). A 5-year backtest shows a typical error of ±9.1%, with 100% of held-out values landing inside the 95% band.19662029
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 →
2025161221
2026161221
2027161221
2028161121
2029161121

Member Species In Delaware

Generalists species in Delaware.
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 →
Eastern TowheePasserellidae-84%
House SparrowPasseridae-81%
Baltimore OrioleIcteridae-76%
American KestrelFalconidae-76%
Black-billed CuckooCuculidae-57%
Common GrackleIcteridae-54%
Field SparrowPasserellidae-54%
Scarlet TanagerCardinalidae-44%
Yellow-breasted ChatIcteriidae-23%
Red-winged BlackbirdIcteridae-21%
Song SparrowPasserellidae-14%
Northern MockingbirdMimidae-3%
Blue JayCorvidae+4%
Belted KingfisherAlcedinidae+4%
Swamp SparrowPasserellidae+7%
American CrowCorvidae+10%
Boat-tailed GrackleIcteridae+14%
Rock PigeonColumbidae+20%
European StarlingSturnidae+20%
Gray CatbirdMimidae+24%
Northern HarrierAccipitridae+26%
Brown ThrasherMimidae+31%
Chipping SparrowPasserellidae+49%
Fish CrowCorvidae+82%
Great Horned OwlStrigidae+88%
Cedar WaxwingBombycillidae+96%
Northern CardinalCardinalidae+114%
American GoldfinchFringillidae+142%
Yellow-billed CuckooCuculidae+152%
Cooper's HawkAccipitridae+164%
Barred OwlStrigidae+173%
Mourning DoveColumbidae+183%
Ruby-throated HummingbirdTrochilidae+188%
Indigo BuntingCardinalidae+197%
Orchard OrioleIcteridae+224%
Brown-headed CowbirdIcteridae+374%
Turkey VultureCathartidae+560%
Blue GrosbeakCardinalidae+564%
Red-tailed HawkAccipitridae+564%
Seaside SparrowPasserellidae+742%
Red-shouldered HawkAccipitridae+776%
OspreyPandionidae+800%
Black VultureCathartidae+807%
Wild TurkeyPhasianidae11×
Summer TanagerCardinalidae12×
House FinchFringillidae29×
Bald EagleAccipitridae34×

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