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Species · Pennsylvania · BBS 2025 Release · 1966–2024

Fish Crow Population Trend in Pennsylvania

All statesGeneralists

Fish Crow in Pennsylvania has surged: up 172% on the route-weighted index since 1968.

+172%Since 1968TrendPercent 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 →
70Routes 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 →
58YearsYears 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 PennsylvaniaNotable 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 Pennsylvania: up 172% on the route-weighted index since 1968.

Fish Crow Population Forecast in Pennsylvania

If the recent trend holds, Fish Crow in Pennsylvania is projected to fall about 22% by 2029 — from 1.1 in 2024 to a central estimate of 0.84 (95% range 0.39–1.3). A 5-year backtest shows a typical error of ±35.2%, with 80% of held-out values landing inside the 95% band.

-22%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 →
0.84Projected 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 →
0.39–1.395% 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 →
±35.2%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 Pennsylvania is projected to fall about 22% by 2029 — from 1.1 in 2024 to a central estimate of 0.84 (95% range 0.39–1.3). A 5-year backtest shows a typical error of ±35.2%, 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 →
20250.790.351.2
20260.800.361.2
20270.810.371.3
20280.830.381.3
20290.840.391.3

Fish Crow Survey Routes in Pennsylvania

Routes recording Fish Crow in Pennsylvania.
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 →
Drehersville 21820242003
Peters Mt1219931974
Mount Joy1020241978
Brick Tavern820241992
West Grove719961973
Clear Spring620241970
Carsonville620232010
Berwick520241986
Landisburg520231978
Doylesburg520232009
Elizabethvil520241996
Schwenksvill520231989
Shrewsbury520231991
Wild Creek420242001
Millville420241992
Pocono Summit420241990
Doe Run420241976
Leola320241999
Mt Gretna 2320222001
Waterstreet320211986
Peru Mills320242013
Mifflintown320241967
New Ringgold320241992
Big Flat319811981
Gatchelville319901972

Fish Crow Population Trend in Other States

alabamaarkansasconnecticutdelawarefloridageorgiaillinoisindianaiowakansaskentuckylouisianamainemarylandmassachusettsmississippimissourinew-hampshirenew-jerseynew-yorknorth-carolinaohiooklahomarhode-islandsouth-carolinatennesseetexasvermontvirginiawest-virginia

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