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

Generalists In Massachusetts

All statesMassachusetts

11 species in this guild. As a group they are -63%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 →

guild collapsecomputed indexTrend sourceWhether the figure is our own computed route-weighted index or an official USGS modeled estimate. The current build labels every trend as computed.Full methodology →

Generalists as a group have fallen sharply in Massachusetts, down 63% since 1968.

Generalists In Massachusetts Population Forecast

If the recent trend holds, Generalists in Massachusetts is projected to fall about 44% by 2030 — from 11 in 2025 to a central estimate of 6.0 (95% range 0.00–13). A 5-year backtest shows a typical error of ±40.3%, with 100% of held-out values landing inside the 95% band.

-44%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 →
6.0Projected 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 →
0.00–1395% 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 →
±40.3%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 Massachusetts is projected to fall about 44% by 2030 — from 11 in 2025 to a central estimate of 6.0 (95% range 0.00–13). A 5-year backtest shows a typical error of ±40.3%, with 100% 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 →
20267.40.7614
20277.00.4114
20286.70.0713
20296.30.0013
20306.00.0013

Member Species In Massachusetts

Generalists species in Massachusetts.
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 →
Common GrackleIcteridae-76%
European StarlingSturnidae-75%
Rock PigeonColumbidae-55%
House SparrowPasseridae-47%
American CrowCorvidae+26%
Brown-headed CowbirdIcteridae+47%
Mourning DoveColumbidae+203%
Northern MockingbirdMimidae+211%
Fish CrowCorvidae+648%
Common RavenCorvidae+860%
House FinchFringillidae13×

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