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

Forest Birds In Maryland

All statesMaryland

50 species in this guild. As a group they are +76%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 Maryland. See the full index history below.

Forest Birds In Maryland Population Forecast

If the recent trend holds, Forest birds in Maryland is projected to stay roughly flat through 2029, near 5.6 (95% range 5.1–6.2). A 5-year backtest shows a typical error of ±7%, with 80% of held-out values landing inside the 95% band.

-7%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 →
5.6Projected 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 →
5.1–6.295% 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%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 Maryland is projected to stay roughly flat through 2029, near 5.6 (95% range 5.1–6.2). A 5-year backtest shows a typical error of ±7%, with 80% 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 →
20255.54.96.1
20265.55.06.1
20275.65.06.1
20285.65.06.2
20295.65.16.2

Member Species In Maryland

Forest birds species in Maryland.
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 →
Marsh WrenTroglodytidae-82%
Kentucky WarblerParulidae-74%
VeeryTurdidae-69%
Prairie WarblerParulidae-64%
Canada WarblerParulidae-49%
Wood ThrushTurdidae-49%
Golden-winged WarblerParulidae-38%
Blue-winged WarblerParulidae-35%
Common YellowthroatParulidae+2%
Black-and-white WarblerParulidae+3%
American RobinTurdidae+6%
Northern House WrenTroglodytidae+20%
White-eyed VireoVireonidae+28%
Winter WrenTroglodytidae+48%
Downy WoodpeckerPicidae+59%
Brown CreeperCerthiidae+78%
Carolina ChickadeeParidae+86%
American RedstartParulidae+90%
Yellow WarblerParulidae+99%
Tufted TitmouseParidae+113%
Chestnut-sided WarblerParulidae+114%
Cerulean WarblerParulidae+117%
Red-bellied WoodpeckerPicidae+120%
Prothonotary WarblerParulidae+129%
Golden-crowned KingletRegulidae+144%
Yellow-throated VireoVireonidae+146%
Red-eyed VireoVireonidae+160%
OvenbirdParulidae+166%
Northern ParulaParulidae+172%
Blackburnian WarblerParulidae+198%
Warbling VireoVireonidae+233%
Hooded WarblerParulidae+241%
Louisiana WaterthrushParulidae+249%
Brown-headed NuthatchSittidae+251%
Pine WarblerParulidae+278%
Hairy WoodpeckerPicidae+328%
Magnolia WarblerParulidae+411%
Yellow-throated WarblerParulidae+538%
Black-throated Blue WarblerParulidae+578%
Blue-gray GnatcatcherPolioptilidae+660%
Worm-eating WarblerParulidae+699%
Eastern BluebirdTurdidae+742%
Hermit ThrushTurdidae+878%
Carolina WrenTroglodytidae11×
White-breasted NuthatchSittidae11×
Black-capped ChickadeeParidae12×
Black-throated Green WarblerParulidae17×
Blue-headed VireoVireonidae17×
Pileated WoodpeckerPicidae20×
Red-headed WoodpeckerPicidae37×

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