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

Fish Crow Population Trend in Delaware

All statesGeneralists

Fish Crow in Delaware has surged: up 82% on the route-weighted index since 1968.

+82%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 →
17Routes 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 DelawareNotable 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 Delaware: up 82% on the route-weighted index since 1968.

Fish Crow Population Forecast in Delaware

If the recent trend holds, Fish Crow in Delaware is projected to fall about 11% by 2029 — from 11 in 2024 to a central estimate of 9.6 (95% range 5.7–14). A 5-year backtest shows a typical error of ±20.2%, with 100% of held-out values landing inside the 95% band.

-11%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 →
9.6Projected 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 →
5.7–1495% 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 →
±20.2%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 Delaware is projected to fall about 11% by 2029 — from 11 in 2024 to a central estimate of 9.6 (95% range 5.7–14). A 5-year backtest shows a typical error of ±20.2%, 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 →
20259.15.213
20269.25.313
20279.45.413
20289.55.513
20299.65.714

Fish Crow Survey Routes in Delaware

Routes recording Fish Crow in Delaware.
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 →
Mt Pleasant2420191970
Bethany Bch2419901966
Millsboro2120242017
Harrington1820241966
Milton1420161966
Dover1219871966
Holleyville1120041968
Milton 21120172017
Wilmington820141966
Georgetown720221992
Frederica620141975
Holleyville 2620242006
Pepperbox520161998
Pepperbox 2520242017
Blackbird420241994
Lowes Xrds319911966
Frankford220121986

Fish Crow Population Trend in Other States

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

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