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

Fish Crow Population Trend in Maryland

All statesGeneralists

Fish Crow in Maryland has surged: up 240% on the route-weighted index since 1968.

+240%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 →
68Routes 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 MarylandNotable 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 Maryland: up 240% on the route-weighted index since 1968.

Fish Crow Population Forecast in Maryland

If the recent trend holds, Fish Crow in Maryland is projected to stay roughly flat through 2029, near 6.5 (95% range 4.5–8.4). A 5-year backtest shows a typical error of ±14%, with 100% of held-out values landing inside the 95% band.

+5%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 →
6.5Projected 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 →
4.5–8.495% 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 →
±14%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 Maryland is projected to stay roughly flat through 2029, near 6.5 (95% range 4.5–8.4). A 5-year backtest shows a typical error of ±14%, 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 →
20256.24.38.2
20266.34.48.2
20276.34.48.3
20286.44.58.3
20296.54.58.4

Fish Crow Survey Routes in Maryland

Routes recording Fish Crow in Maryland.
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 →
Williamsport2620241966
Olney2520241966
Cokesbury1920241966
Wheaton1920241990
Warfieldsbrg1820241966
Norwood1720121971
Elkton1520241970
Madison1520241967
Ijamsville1520241986
Sinepuxent1319781966
Walnut1320241999
Forest Grove1220232012
Eklo1120181972
Randallstown1120131972
Melitota1120241966
St. George'S Island1020172015
Furnace Town1020242015
Emmitsburg920241966
Piney Neck920241966
Harmony920171966
Tall Timbers820141966
Madonna820222009
Silver Spg619891977
Beltsville620121966
Wolfsville520241972

Fish Crow Population Trend in Other States

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

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