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

Generalists In Maryland

All statesMaryland

54 species in this guild. As a group they are -37%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 generalists in Maryland. See the full index history below.

Generalists In Maryland Population Forecast

If the recent trend holds, Generalists in Maryland is projected to fall about 20% by 2029 — from 11 in 2024 to a central estimate of 9.0 (95% range 7.0–11). A 5-year backtest shows a typical error of ±12.4%, with 80% of held-out values landing inside the 95% band.

-20%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 →
9.0Projected 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 →
7.0–1195% 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 →
±12.4%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, Generalists in Maryland is projected to fall about 20% by 2029 — from 11 in 2024 to a central estimate of 9.0 (95% range 7.0–11). A 5-year backtest shows a typical error of ±12.4%, 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 →
20259.47.511
20269.37.411
20279.27.311
20289.17.111
20299.07.011

Member Species In Maryland

Generalists 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-84%
House SparrowPasseridae-80%
Common GrackleIcteridae-77%
Black-billed CuckooCuculidae-77%
Field SparrowPasserellidae-76%
Boat-tailed GrackleIcteridae-65%
Rock PigeonColumbidae-59%
Belted KingfisherAlcedinidae-58%
Eastern Screech-OwlStrigidae-54%
Red-winged BlackbirdIcteridae-47%
Great Horned OwlStrigidae-46%
Eastern TowheePasserellidae-43%
European StarlingSturnidae-43%
American KestrelFalconidae-41%
Northern MockingbirdMimidae-37%
Blue JayCorvidae-33%
Ruffed GrousePhasianidae-30%
Northern HarrierAccipitridae-26%
Yellow-billed CuckooCuculidae-14%
Brown ThrasherMimidae-9%
Baltimore OrioleIcteridae+0%
American CrowCorvidae+2%
Indigo BuntingCardinalidae+20%
Mourning DoveColumbidae+26%
Song SparrowPasserellidae+31%
Brown-headed CowbirdIcteridae+37%
Swamp SparrowPasserellidae+40%
Scarlet TanagerCardinalidae+41%
Seaside SparrowPasserellidae+44%
Gray CatbirdMimidae+58%
Chipping SparrowPasserellidae+59%
American GoldfinchFringillidae+66%
Northern CardinalCardinalidae+68%
Broad-winged HawkAccipitridae+75%
Sharp-shinned HawkAccipitridae+88%
Orchard OrioleIcteridae+114%
Ruby-throated HummingbirdTrochilidae+169%
Blue GrosbeakCardinalidae+209%
Summer TanagerCardinalidae+219%
Fish CrowCorvidae+240%
Turkey VultureCathartidae+392%
Purple FinchFringillidae+412%
Barred OwlStrigidae+490%
Red-tailed HawkAccipitridae+635%
Rose-breasted GrosbeakCardinalidae+818%
OspreyPandionidae12×
Cooper's HawkAccipitridae13×
Red-shouldered HawkAccipitridae13×
Wild TurkeyPhasianidae15×
Cedar WaxwingBombycillidae20×
Bald EagleAccipitridae60×
Black VultureCathartidae63×
House FinchFringillidae73×
Common RavenCorvidae87×

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