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

Common Raven Population Trend in Maine

All statesGeneralists

Common Raven in Maine has edged down: down 24% on the route-weighted index since 1968.

-24%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 →
76Routes 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 Common Raven Trends in MaineNotable signalsLong-arc shifts the engine flags automatically — sustained declines or increases large enough to stand out from year-to-year noise.Full methodology →

No notable trend signals for Common Raven in Maine. See the full index history below.

Common Raven Population Forecast in Maine

If the recent trend holds, Common Raven in Maine is projected to rise about 43% by 2029 — from 2.3 in 2024 to a central estimate of 3.3 (95% range 0.92–5.7). A 5-year backtest shows a typical error of ±32.7%, with 100% of held-out values landing inside the 95% band.

+43%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 →
3.3Projected 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 →
0.92–5.795% 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 →
±32.7%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, Common Raven in Maine is projected to rise about 43% by 2029 — from 2.3 in 2024 to a central estimate of 3.3 (95% range 0.92–5.7). A 5-year backtest shows a typical error of ±32.7%, 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 →
20253.41.005.8
20263.40.985.8
20273.40.965.8
20283.30.945.7
20293.30.925.7

Common Raven Survey Routes in Maine

Routes recording Common Raven in Maine.
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 →
Ft Fairfield3020051993
Aurora1620211975
Brooks1420191977
Northfield1319811976
Ludlow1319981968
Washburn1320051979
Cooper1120211975
Deblois920071967
Hartford820241976
Benedicta720191976
Waite719771977
Telos720061995
Heron Lake720021983
South Arm620131977
East Troy620191973
Moose River620081983
St David620051982
Clayton Lake 2620132010
Stacyville620242022
Northfield 2520221992
Bowdoin Ctr520131971
Hermon520181974
Castine520061976
Carrying Pl520241979
Medway520181976

Common Raven Population Trend in Other States

alaskaarizonacaliforniacoloradoconnecticutgeorgiaidahokentuckymarylandmassachusettsmichiganminnesotamontananebraskanevadanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomaoregonpennsylvaniarhode-islandsouth-carolinatennesseetexasutahvermontvirginiawashingtonwest-virginiawisconsinwyoming

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