BirdAnalyst
Guild · New Hampshire · BBS 2025 Release · 1966–2024

Generalists In New Hampshire

All statesNew Hampshire

53 species in this guild. As a group they are -40%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 New Hampshire. See the full index history below.

Generalists In New Hampshire Population Forecast

If the recent trend holds, Generalists in New Hampshire is projected to stay roughly flat through 2029, near 3.8 (95% range 2.9–4.6). A 5-year backtest shows a typical error of ±6.6%, with 100% of held-out values landing inside the 95% band.

-6%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 →
3.8Projected 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 →
2.9–4.695% 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 →
±6.6%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 New Hampshire is projected to stay roughly flat through 2029, near 3.8 (95% range 2.9–4.6). A 5-year backtest shows a typical error of ±6.6%, 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 →
20254.03.24.8
20263.93.14.8
20273.93.14.7
20283.83.04.7
20293.82.94.6

Member Species In New Hampshire

Generalists species in New Hampshire.
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-97%
Brown ThrasherMimidae-91%
Field SparrowPasserellidae-88%
Ruffed GrousePhasianidae-88%
European StarlingSturnidae-82%
Evening GrosbeakFringillidae-79%
White-throated SparrowPasserellidae-79%
Pine SiskinFringillidae-76%
Lincoln's SparrowPasserellidae-75%
Black-billed CuckooCuculidae-73%
Rusty BlackbirdIcteridae-69%
Baltimore OrioleIcteridae-67%
Purple FinchFringillidae-65%
Brown-headed CowbirdIcteridae-62%
Rose-breasted GrosbeakCardinalidae-54%
American KestrelFalconidae-53%
Common GrackleIcteridae-52%
Red-winged BlackbirdIcteridae-52%
Blue JayCorvidae-48%
House SparrowPasseridae-39%
Rock PigeonColumbidae-39%
Swamp SparrowPasserellidae-19%
Belted KingfisherAlcedinidae-11%
Great Horned OwlStrigidae-9%
Sharp-shinned HawkAccipitridae-4%
Gray CatbirdMimidae-3%
Scarlet TanagerCardinalidae-2%
Song SparrowPasserellidae+2%
Red-shouldered HawkAccipitridae+13%
American GoldfinchFringillidae+13%
Cooper's HawkAccipitridae+23%
Orchard OrioleIcteridae+36%
Cedar WaxwingBombycillidae+43%
Canada JayCorvidae+58%
American CrowCorvidae+65%
Bald EagleAccipitridae+66%
Chipping SparrowPasserellidae+88%
Broad-winged HawkAccipitridae+106%
Ruby-throated HummingbirdTrochilidae+119%
Fish CrowCorvidae+131%
Yellow-billed CuckooCuculidae+134%
Red CrossbillFringillidae+146%
OspreyPandionidae+147%
Indigo BuntingCardinalidae+192%
Mourning DoveColumbidae+304%
Barred OwlStrigidae+363%
Red-tailed HawkAccipitridae+459%
Turkey VultureCathartidae+625%
House FinchFringillidae+681%
Northern MockingbirdMimidae+856%
Common RavenCorvidae11×
Wild TurkeyPhasianidae41×
Northern CardinalCardinalidae178×

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