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

Forest Birds In Connecticut

All statesConnecticut

65 species in this guild. As a group they are -14%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 Connecticut. See the full index history below.

Forest Birds In Connecticut Population Forecast

If the recent trend holds, Forest birds in Connecticut is projected to stay roughly flat through 2030, near 7.6 (95% range 5.3–9.9). A 5-year backtest shows a typical error of ±9.3%, with 100% of held-out values landing inside the 95% band.

+3%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 →
7.6Projected 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 →
5.3–9.995% 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 →
±9.3%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 Connecticut is projected to stay roughly flat through 2030, near 7.6 (95% range 5.3–9.9). A 5-year backtest shows a typical error of ±9.3%, 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 →
20267.55.29.9
20277.65.29.9
20287.65.39.9
20297.65.39.9
20307.65.39.9

Member Species In Connecticut

Forest birds species in Connecticut.
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 →
Brown ThrasherMimidae-97%
Field SparrowPasserellidae-97%
Purple FinchFringillidae-91%
Eastern TowheePasserellidae-87%
Canada WarblerParulidae-85%
Blue-winged WarblerParulidae-79%
Baltimore OrioleIcteridae-79%
Rose-breasted GrosbeakCardinalidae-72%
Yellow-billed CuckooCuculidae-71%
Black-billed CuckooCuculidae-71%
Prairie WarblerParulidae-69%
White-throated SparrowPasserellidae-64%
Chestnut-sided WarblerParulidae-62%
Blue JayCorvidae-61%
Red-breasted NuthatchSittidae-59%
Northern WaterthrushParulidae-53%
Wood ThrushTurdidae-50%
Hermit ThrushTurdidae-48%
Song SparrowPasserellidae-31%
Black-and-white WarblerParulidae-28%
Hairy WoodpeckerPicidae-27%
Black-throated Green WarblerParulidae-23%
Common YellowthroatParulidae-21%
Scarlet TanagerCardinalidae-20%
Indigo BuntingCardinalidae-20%
Blackburnian WarblerParulidae-16%
American RobinTurdidae-10%
Blue-headed VireoVireonidae-7%
White-eyed VireoVireonidae-3%
Black-throated Blue WarblerParulidae-1%
Downy WoodpeckerPicidae+2%
Northern House WrenTroglodytidae+2%
Magnolia WarblerParulidae+11%
VeeryTurdidae+13%
Black-capped ChickadeeParidae+28%
Chipping SparrowPasserellidae+28%
Orchard OrioleIcteridae+28%
Winter WrenTroglodytidae+32%
Cerulean WarblerParulidae+43%
Gray CatbirdMimidae+47%
American RedstartParulidae+74%
Yellow-throated VireoVireonidae+76%
OvenbirdParulidae+81%
American GoldfinchFringillidae+83%
Brown CreeperCerthiidae+98%
Northern ParulaParulidae+101%
Red-eyed VireoVireonidae+101%
White-breasted NuthatchSittidae+128%
Yellow WarblerParulidae+161%
Pileated WoodpeckerPicidae+178%
Hooded WarblerParulidae+198%
Warbling VireoVireonidae+205%
Eastern BluebirdTurdidae+250%
Cedar WaxwingBombycillidae+254%
Northern CardinalCardinalidae+261%
Ruby-throated HummingbirdTrochilidae+266%
Louisiana WaterthrushParulidae+286%
Tufted TitmouseParidae+382%
Yellow-bellied SapsuckerPicidae+437%
Marsh WrenTroglodytidae+442%
Worm-eating WarblerParulidae+602%
Blue-gray GnatcatcherPolioptilidae12×
Red-bellied WoodpeckerPicidae24×
Pine WarblerParulidae32×
Carolina WrenTroglodytidae33×

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