BirdAnalyst
Species · BCR 12 · BBS 2025 Release · 1966–2024

Common Raven In Boreal Hardwood Transition

All regionsBoreal Hardwood TransitionGeneralists

Common Raven in Boreal Hardwood Transition has surged: up 96% on the route-weighted index since 1968.

+96%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 →
125Routes In RegionSurvey 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 SignalsNotable 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 →

Common Raven has surged in Boreal Hardwood Transition: up 96% on the route-weighted index since 1968.

Forecast

If the recent trend holds, Common Raven in Boreal Hardwood Transition is projected to rise about 18% by 2029 — from 6.0 in 2024 to a central estimate of 7.1 (95% range 5.7–8.5). A 5-year backtest shows a typical error of ±10.8%, with 100% of held-out values landing inside the 95% band.

+18%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 →
7.1Projected 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 →
5.7–8.595% 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 →
±10.8%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, Common Raven in Boreal Hardwood Transition is projected to rise about 18% by 2029 — from 6.0 in 2024 to a central estimate of 7.1 (95% range 5.7–8.5). A 5-year backtest shows a typical error of ±10.8%, 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 →
20256.85.48.3
20266.95.48.3
20277.05.58.4
20287.05.68.5
20297.15.78.5

Routes In Boreal Hardwood Transition

Routes recording Common Raven in Boreal Hardwood Transition.
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 →
Hiawatha NfMICHIGAN342024
Sand LakeMICHIGAN232024
AmbergWISCONSIN212024
ConoverWISCONSIN202024
Cluster LakesMICHIGAN192010
Betchler LksMICHIGAN182024
Skegemog PtMICHIGAN152024
RacoMICHIGAN152024
RiggsvilleMICHIGAN152019
LudeMINNESOTA152023
Island LakeMINNESOTA132017
CunardMICHIGAN122021
PickfordMICHIGAN122024
FredericMICHIGAN122003
GlendaleMINNESOTA122024
FlambeauWISCONSIN122024
OntonagonMICHIGAN112019
WilsonMICHIGAN112010
CreightonMICHIGAN112023
Pine RiverMICHIGAN112021
Scott'S MarshMICHIGAN112010
NebishMINNESOTA112023
Grand ViewWISCONSIN112024
Union TwpWISCONSIN112024
GilmanWISCONSIN112024

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