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

Northern Mockingbird Population Trend in Maine

All statesGeneralists

Northern Mockingbird in Maine has declined: down 46% on the route-weighted index since 1972.

-46%Since 1972TrendPercent 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 →
40Routes 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 →
51YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Northern Mockingbird 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 Northern Mockingbird in Maine. See the full index history below.

Northern Mockingbird Population Forecast in Maine

If the recent trend holds, Northern Mockingbird in Maine is projected to fall about 62% by 2029 — from 0.26 in 2024 to a central estimate of 0.10 (95% range 0.00–0.47). A 5-year backtest shows a typical error of ±60.8%, with 100% of held-out values landing inside the 95% band.

-62%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 →
0.10Projected 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 →
0.00–0.4795% 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 →
±60.8%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, Northern Mockingbird in Maine is projected to fall about 62% by 2029 — from 0.26 in 2024 to a central estimate of 0.10 (95% range 0.00–0.47). A 5-year backtest shows a typical error of ±60.8%, 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 →
20250.120.000.50
20260.120.000.49
20270.110.000.48
20280.100.000.48
20290.100.000.47

Northern Mockingbird Survey Routes in Maine

Routes recording Northern Mockingbird 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 →
Turner620021974
Biddeford520181974
Cape Neddick320241972
Otisfield Gr320081966
Bowdoin Ctr319931991
Forest Sta319841972
Westbrook220171977
Deblois219911966
Cambridge219971996
Cornville220242023
Kittery Pt120231966
Northfield 2119981993
Bethel119991994
Greenwood119761966
Reeds119981998
South Arm120122012
Hartford120211979
Manchester119811981
East Troy120082008
Warren119801980
Freedom120072001
Harmony120111975
Topsfield119901990
Brooks119881984
Hermon120181980

Northern Mockingbird Population Trend in Other States

alabamaarizonaarkansascaliforniacoloradoconnecticutdelawarefloridageorgiaidahoillinoisindianaiowakansaskentuckylouisianamarylandmassachusettsmichiganminnesotamississippimissourimontananebraskanevadanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomaoregonpennsylvaniarhode-islandsouth-carolinasouth-dakotatennesseetexasutahvermontvirginiawashingtonwest-virginiawisconsinwyoming

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