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

Forest Birds In Maryland

All statesMaryland

72 species in this guild. As a group they are +49%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 2030, near 7.2 (95% range 6.5–7.8). A 5-year backtest shows a typical error of ±7.5%, with 40% of held-out values landing inside the 95% band.

-8%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 →
7.2Projected 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 →
6.5–7.895% 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 →
±7.5%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 2030, near 7.2 (95% range 6.5–7.8). A 5-year backtest shows a typical error of ±7.5%, 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 →
20267.06.47.7
20277.16.47.7
20287.16.47.8
20297.16.57.8
20307.26.57.8

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 →
Yellow-breasted ChatIcteriidae-83%
Marsh WrenTroglodytidae-82%
Kentucky WarblerParulidae-81%
Black-billed CuckooCuculidae-77%
Field SparrowPasserellidae-76%
Prairie WarblerParulidae-71%
Canada WarblerParulidae-58%
VeeryTurdidae-56%
Wood ThrushTurdidae-50%
Eastern TowheePasserellidae-47%
Golden-winged WarblerParulidae-38%
Blue-winged WarblerParulidae-35%
Yellow-billed CuckooCuculidae-33%
Blue JayCorvidae-32%
Black-and-white WarblerParulidae-6%
Brown ThrasherMimidae-6%
Baltimore OrioleIcteridae+3%
Common YellowthroatParulidae+4%
American RobinTurdidae+8%
Northern House WrenTroglodytidae+12%
Indigo BuntingCardinalidae+17%
White-eyed VireoVireonidae+20%
Song SparrowPasserellidae+27%
Scarlet TanagerCardinalidae+41%
Downy WoodpeckerPicidae+44%
Winter WrenTroglodytidae+48%
Gray CatbirdMimidae+56%
Chipping SparrowPasserellidae+60%
American GoldfinchFringillidae+69%
Northern CardinalCardinalidae+70%
Brown CreeperCerthiidae+78%
Yellow WarblerParulidae+82%
American RedstartParulidae+95%
Carolina ChickadeeParidae+97%
Orchard OrioleIcteridae+99%
Chestnut-sided WarblerParulidae+106%
Yellow-throated VireoVireonidae+111%
Prothonotary WarblerParulidae+113%
Red-bellied WoodpeckerPicidae+121%
Cerulean WarblerParulidae+123%
Tufted TitmouseParidae+123%
Ruby-throated HummingbirdTrochilidae+138%
Golden-crowned KingletRegulidae+144%
Blackburnian WarblerParulidae+148%
Red-eyed VireoVireonidae+153%
OvenbirdParulidae+160%
Warbling VireoVireonidae+168%
Northern ParulaParulidae+180%
Louisiana WaterthrushParulidae+201%
Blue GrosbeakCardinalidae+221%
Hooded WarblerParulidae+231%
Hairy WoodpeckerPicidae+250%
Summer TanagerCardinalidae+260%
Pine WarblerParulidae+277%
Purple FinchFringillidae+347%
Magnolia WarblerParulidae+472%
Brown-headed NuthatchSittidae+496%
Yellow-throated WarblerParulidae+547%
Worm-eating WarblerParulidae+696%
Eastern BluebirdTurdidae+697%
Blue-gray GnatcatcherPolioptilidae+708%
Rose-breasted GrosbeakCardinalidae+724%
Hermit ThrushTurdidae+746%
Black-throated Blue WarblerParulidae+788%
Carolina WrenTroglodytidae+959%
White-breasted NuthatchSittidae+988%
Black-capped ChickadeeParidae13×
Blue-headed VireoVireonidae14×
Black-throated Green WarblerParulidae16×
Pileated WoodpeckerPicidae20×
Cedar WaxwingBombycillidae29×
Red-headed WoodpeckerPicidae42×

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