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

Forest Birds In Maine

All statesMaine

51 species in this guild. As a group they are +0%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 12% by 2029 — from 5.2 in 2024 to a central estimate of 4.6 (95% range 3.4–5.8). A 5-year backtest shows a typical error of ±7.9%, with 100% of held-out values landing inside the 95% band.

-12%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 →
4.6Projected 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 →
3.4–5.895% 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 →
±7.9%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 12% by 2029 — from 5.2 in 2024 to a central estimate of 4.6 (95% range 3.4–5.8). A 5-year backtest shows a typical error of ±7.9%, 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 →
20254.73.45.9
20264.63.45.9
20274.63.45.9
20284.63.45.9
20294.63.45.8

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 →
Boreal ChickadeeParidae-90%
Ruby-crowned KingletRegulidae-89%
Tennessee WarblerParulidae-87%
Wood ThrushTurdidae-86%
Canada WarblerParulidae-85%
Wilson's WarblerParulidae-84%
Blackpoll WarblerParulidae-83%
Bay-breasted WarblerParulidae-74%
Cape May WarblerParulidae-74%
Mourning WarblerParulidae-72%
Yellow-throated VireoVireonidae-71%
Magnolia WarblerParulidae-66%
Nashville WarblerParulidae-66%
Northern WaterthrushParulidae-64%
American RobinTurdidae-53%
Black-backed WoodpeckerPicidae-53%
Swainson's ThrushTurdidae-52%
VeeryTurdidae-44%
Yellow WarblerParulidae-42%
Hermit ThrushTurdidae-25%
Yellow-bellied SapsuckerPicidae-19%
American RedstartParulidae-19%
Golden-crowned KingletRegulidae-18%
Common YellowthroatParulidae-16%
Marsh WrenTroglodytidae-8%
Winter WrenTroglodytidae+8%
Chestnut-sided WarblerParulidae+9%
Palm WarblerParulidae+16%
Northern House WrenTroglodytidae+22%
Black-throated Green WarblerParulidae+38%
Hairy WoodpeckerPicidae+62%
Blackburnian WarblerParulidae+65%
Black-throated Blue WarblerParulidae+96%
Black-capped ChickadeeParidae+106%
OvenbirdParulidae+108%
Philadelphia VireoVireonidae+109%
Black-and-white WarblerParulidae+111%
Red-breasted NuthatchSittidae+111%
Pileated WoodpeckerPicidae+113%
Brown CreeperCerthiidae+120%
Downy WoodpeckerPicidae+126%
Warbling VireoVireonidae+133%
Prairie WarblerParulidae+196%
Eastern BluebirdTurdidae+199%
Red-eyed VireoVireonidae+221%
Blue-headed VireoVireonidae+253%
White-breasted NuthatchSittidae+257%
Northern ParulaParulidae+383%
Carolina WrenTroglodytidae15×
Pine WarblerParulidae80×
Tufted TitmouseParidae214×

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