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

Forest Birds In Maine

All statesMaine

77 species in this guild. As a group they are -9%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 Maine. See the full index history below.

Forest Birds In Maine Population Forecast

If the recent trend holds, Forest birds in Maine is projected to fall about 23% by 2030 — from 5.3 in 2025 to a central estimate of 4.1 (95% range 2.9–5.3). A 5-year backtest shows a typical error of ±21.4%, with 40% of held-out values landing inside the 95% band.

-23%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 →
4.1Projected 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 →
2.9–5.395% 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 →
±21.4%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, Forest birds in Maine is projected to fall about 23% by 2030 — from 5.3 in 2025 to a central estimate of 4.1 (95% range 2.9–5.3). A 5-year backtest shows a typical error of ±21.4%, with 40% 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 →
20264.23.05.4
20274.23.05.3
20284.13.05.3
20294.12.95.3
20304.12.95.3

Member Species In Maine

Forest birds species in Maine.
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-95%
Boreal ChickadeeParidae-91%
Ruby-crowned KingletRegulidae-91%
Field SparrowPasserellidae-88%
Tennessee WarblerParulidae-87%
Evening GrosbeakFringillidae-86%
Wood ThrushTurdidae-86%
Brown ThrasherMimidae-85%
Purple FinchFringillidae-85%
Canada WarblerParulidae-85%
Wilson's WarblerParulidae-84%
Blackpoll WarblerParulidae-84%
Lincoln's SparrowPasserellidae-77%
Bay-breasted WarblerParulidae-76%
White-throated SparrowPasserellidae-75%
Cape May WarblerParulidae-74%
Mourning WarblerParulidae-73%
Yellow-throated VireoVireonidae-71%
Rose-breasted GrosbeakCardinalidae-69%
Northern WaterthrushParulidae-63%
Magnolia WarblerParulidae-63%
American RobinTurdidae-54%
Nashville WarblerParulidae-54%
Pine SiskinFringillidae-53%
Black-backed WoodpeckerPicidae-53%
Swainson's ThrushTurdidae-51%
Baltimore OrioleIcteridae-50%
Canada JayCorvidae-50%
American GoldfinchFringillidae-49%
Black-billed CuckooCuculidae-47%
Song SparrowPasserellidae-42%
VeeryTurdidae-36%
Yellow WarblerParulidae-34%
Yellow-bellied SapsuckerPicidae-31%
Scarlet TanagerCardinalidae-31%
Blue JayCorvidae-24%
Hermit ThrushTurdidae-24%
Gray CatbirdMimidae-16%
Common YellowthroatParulidae-11%
Ruby-throated HummingbirdTrochilidae-9%
Marsh WrenTroglodytidae-8%
American RedstartParulidae-5%
Golden-crowned KingletRegulidae-1%
Winter WrenTroglodytidae+9%
Chestnut-sided WarblerParulidae+13%
Fox SparrowPasserellidae+15%
Palm WarblerParulidae+31%
Northern House WrenTroglodytidae+35%
Black-throated Green WarblerParulidae+41%
White-winged CrossbillFringillidae+60%
Hairy WoodpeckerPicidae+61%
Pileated WoodpeckerPicidae+72%
Yellow-billed CuckooCuculidae+86%
Black-throated Blue WarblerParulidae+90%
Downy WoodpeckerPicidae+95%
Blackburnian WarblerParulidae+97%
Black-capped ChickadeeParidae+101%
Cedar WaxwingBombycillidae+105%
OvenbirdParulidae+109%
Chipping SparrowPasserellidae+112%
Brown CreeperCerthiidae+114%
Philadelphia VireoVireonidae+123%
Black-and-white WarblerParulidae+148%
Red-breasted NuthatchSittidae+149%
Warbling VireoVireonidae+157%
Eastern BluebirdTurdidae+175%
Blue-headed VireoVireonidae+203%
Prairie WarblerParulidae+214%
White-breasted NuthatchSittidae+233%
Red CrossbillFringillidae+245%
Red-eyed VireoVireonidae+248%
Indigo BuntingCardinalidae+307%
Northern ParulaParulidae+419%
Carolina WrenTroglodytidae16×
Northern CardinalCardinalidae51×
Pine WarblerParulidae82×
Tufted TitmouseParidae238×

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