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

Forest Birds In Delaware

All statesDelaware

53 species in this guild. As a group they are +91%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 forest birds in Delaware. See the full index history below.

Forest Birds In Delaware Population Forecast

If the recent trend holds, Forest birds in Delaware is projected to stay roughly flat through 2030, near 9.5 (95% range 7.6–11). A 5-year backtest shows a typical error of ±12.3%, with 80% of held-out values landing inside the 95% band.

-2%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 →
9.5Projected 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 →
7.6–1195% 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 →
±12.3%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, Forest birds in Delaware is projected to stay roughly flat through 2030, near 9.5 (95% range 7.6–11). A 5-year backtest shows a typical error of ±12.3%, with 80% 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 →
20269.27.311
20279.37.411
20289.47.511
20299.57.511
20309.57.611

Member Species In Delaware

Forest birds 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-82%
Baltimore OrioleIcteridae-80%
Kentucky WarblerParulidae-80%
Prairie WarblerParulidae-63%
Yellow-throated VireoVireonidae-61%
American RedstartParulidae-57%
Black-billed CuckooCuculidae-57%
Field SparrowPasserellidae-56%
Black-and-white WarblerParulidae-52%
Warbling VireoVireonidae-44%
Scarlet TanagerCardinalidae-31%
Yellow-breasted ChatIcteriidae-30%
Hooded WarblerParulidae-24%
Yellow WarblerParulidae-17%
Song SparrowPasserellidae-12%
Wood ThrushTurdidae-11%
Northern House WrenTroglodytidae-5%
Blue JayCorvidae-2%
Gray CatbirdMimidae+22%
White-eyed VireoVireonidae+38%
Yellow-billed CuckooCuculidae+39%
Louisiana WaterthrushParulidae+41%
Chipping SparrowPasserellidae+56%
American RobinTurdidae+59%
Brown ThrasherMimidae+60%
Red-eyed VireoVireonidae+66%
Common YellowthroatParulidae+77%
Tufted TitmouseParidae+103%
American GoldfinchFringillidae+137%
Northern CardinalCardinalidae+141%
Cedar WaxwingBombycillidae+160%
Ruby-throated HummingbirdTrochilidae+167%
Downy WoodpeckerPicidae+172%
Red-bellied WoodpeckerPicidae+185%
Indigo BuntingCardinalidae+192%
Marsh WrenTroglodytidae+233%
OvenbirdParulidae+236%
Yellow-throated WarblerParulidae+253%
Orchard OrioleIcteridae+265%
Red-headed WoodpeckerPicidae+269%
Hairy WoodpeckerPicidae+350%
Brown-headed NuthatchSittidae+363%
Prothonotary WarblerParulidae+370%
Pine WarblerParulidae+412%
Carolina ChickadeeParidae+449%
Worm-eating WarblerParulidae+548%
Blue GrosbeakCardinalidae+579%
White-breasted NuthatchSittidae+751%
Carolina WrenTroglodytidae12×
Summer TanagerCardinalidae12×
Blue-gray GnatcatcherPolioptilidae17×
Eastern BluebirdTurdidae18×
Pileated WoodpeckerPicidae35×

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