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

Common Raven Population Trend in Massachusetts

All statesGeneralists

Common Raven in Massachusetts has surged: up 860% on the route-weighted index since 1985.

+860%Since 1985TrendPercent 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 →
21Routes In StateSurvey routesHow many standard-protocol BBS routes contributed counts. More routes means a steadier, better-sampled index; very thin coverage is suppressed.Full methodology →
39YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Common Raven Trends in MassachusettsNotable signalsLong-arc shifts the engine flags automatically — sustained declines or increases large enough to stand out from year-to-year noise.Full methodology →

long arc increasecomputed 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 →

Common Raven has surged in Massachusetts: up 859% on the route-weighted index since 1985.

Common Raven Population Forecast in Massachusetts

If the recent trend holds, Common Raven in Massachusetts is projected to stay roughly flat through 2030, near 1.4 (95% range 0.47–2.4). A 5-year backtest shows a typical error of ±36.8%, with 100% of held-out values landing inside the 95% band.

+4%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 →
1.4Projected 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 →
0.47–2.495% 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 →
±36.8%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, Common Raven in Massachusetts is projected to stay roughly flat through 2030, near 1.4 (95% range 0.47–2.4). A 5-year backtest shows a typical error of ±36.8%, with 100% of held-out values landing inside the 95% band.19822030
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 →
20261.30.352.3
20271.30.382.3
20281.40.412.3
20291.40.442.4
20301.40.472.4

Common Raven Survey Routes in Massachusetts

Routes recording Common Raven in Massachusetts.
Recent countThe raw number of individuals recorded on this route in its most recent survey year. A single-route tally, not a trend.Full methodology →
Chesterfield720251991
Mansfield420252011
N Orange420251982
Cummington420131984
Littleton320252005
Cheshire319941989
Prattville220152015
S Barre220212021
Pittsfield220161985
Sheffield220221991
Monterey220242019
N. Andover220182018
Ware River120221994
Maynard120252018
N Oxford120222022
Belchertown120252000
Gay Head120252025
Holden120242003
Warren 2120242022
Cummington 2120252015
Hancock120151997

Common Raven Population Trend in Other States

alaskaarizonacaliforniacoloradoconnecticutgeorgiaidahokentuckymainemarylandmichiganminnesotamontananebraskanevadanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomaoregonpennsylvaniarhode-islandsouth-carolinatennesseetexasutahvermontvirginiawashingtonwest-virginiawisconsinwyoming

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