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

Fish Crow Population Trend in Tennessee

All statesGeneralists

Fish Crow in Tennessee has surged: up 871% on the route-weighted index since 1970.

+871%Since 1970TrendPercent 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 →
12Routes 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 →
47YearsYears 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 TennesseeNotable 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 Tennessee: up 871% on the route-weighted index since 1970.

Fish Crow Population Forecast in Tennessee

If the recent trend holds, Fish Crow in Tennessee is projected to fall about 70% by 2029 — from 0.77 in 2024 to a central estimate of 0.23 (95% range 0.01–0.46). A 5-year backtest shows a typical error of ±58.7%, with 40% of held-out values landing inside the 95% band.

-70%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 →
0.23Projected 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 →
0.01–0.4695% 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 →
±58.7%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 Tennessee is projected to fall about 70% by 2029 — from 0.77 in 2024 to a central estimate of 0.23 (95% range 0.01–0.46). A 5-year backtest shows a typical error of ±58.7%, with 40% 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 →
20250.220.000.45
20260.220.000.45
20270.230.000.45
20280.230.010.46
20290.230.010.46

Fish Crow Survey Routes in Tennessee

Routes recording Fish Crow in Tennessee.
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 →
Signal Mtn820242013
Tiptonville520231966
Moscow520241976
Mansfield420222007
Humboldt420242022
Pawpaw320111981
Brownsville120102005
Tibbs120211993
Whiteville119701970
Big Sandy120222021
Fish Springs120232023
Pawpaw 2120232014

Fish Crow Population Trend in Other States

alabamaarkansasconnecticutdelawarefloridageorgiaillinoisindianaiowakansaskentuckylouisianamainemarylandmassachusettsmississippimissourinew-hampshirenew-jerseynew-yorknorth-carolinaohiooklahomapennsylvaniarhode-islandsouth-carolinatexasvermontvirginiawest-virginia

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