BirdAnalyst
Species · Massachusetts · BBS 2025 Release · 1966–2024

Fish Crow Population Trend in Massachusetts

All statesGeneralists

Fish Crow in Massachusetts has surged: up 764% on the route-weighted index since 1992.

+764%Since 1992TrendPercent 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 →
15Routes 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 →
33YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Fish Crow 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 →

Fish Crow has surged in Massachusetts: up 764% on the route-weighted index since 1992.

Fish Crow Population Forecast in Massachusetts

If the recent trend holds, Fish Crow in Massachusetts is projected to rise about 143% by 2029 — from 0.60 in 2024 to a central estimate of 1.5 (95% range 0.73–2.2). A 5-year backtest shows a typical error of ±65%, with 60% of held-out values landing inside the 95% band.

+143%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 →
1.5Projected 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 →
0.73–2.295% 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 →
±65%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, Fish Crow in Massachusetts is projected to rise about 143% by 2029 — from 0.60 in 2024 to a central estimate of 1.5 (95% range 0.73–2.2). A 5-year backtest shows a typical error of ±65%, with 60% of held-out values landing inside the 95% band.19852029
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 →
20251.30.582.0
20261.30.622.1
20271.40.652.1
20281.40.692.2
20291.50.732.2

Fish Crow Survey Routes in Massachusetts

Routes recording Fish Crow 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 →
Marion620241993
Mansfield220241991
Belchertown220192019
S Barre220192019
E Dennis120212008
Wellfleet120051991
Prattville120192002
Brockton120191985
Newburyport119971994
Maynard119951995
Wellfleet 2120242016
Cape Cod Ns119981992
Holden120232022
N. Andover120232018
Warren 2120232023

Fish Crow Population Trend in Other States

alabamaarkansasconnecticutdelawarefloridageorgiaillinoisindianaiowakansaskentuckylouisianamainemarylandmississippimissourinew-hampshirenew-jerseynew-yorknorth-carolinaohiooklahomapennsylvaniarhode-islandsouth-carolinatennesseetexasvermontvirginiawest-virginia

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