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Species · Alabama · BBS 2026 Release · 1966–2025

Brown-headed Nuthatch Population Trend in Alabama

All statesForest birds

Brown-headed Nuthatch in Alabama has held roughly steady: down 7% on the route-weighted index since 1968.

-7%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 →
93Routes 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 →
59YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Brown-headed Nuthatch Trends in AlabamaNotable 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 Brown-headed Nuthatch in Alabama. See the full index history below.

Brown-headed Nuthatch Population Forecast in Alabama

If the recent trend holds, Brown-headed Nuthatch in Alabama is projected to stay roughly flat through 2030, near 1.6 (95% range 0.69–2.5). A 5-year backtest shows a typical error of ±7.8%, with 100% of held-out values landing inside the 95% band.

-4%Change by 2030TrendPercent 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 →
1.6Projected 2030 indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →
0.69–2.595% 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 →
±7.8%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, Brown-headed Nuthatch in Alabama is projected to stay roughly flat through 2030, near 1.6 (95% range 0.69–2.5). A 5-year backtest shows a typical error of ±7.8%, with 100% of held-out values landing inside the 95% band.19662030
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 →
20261.60.732.5
20271.60.722.5
20281.60.712.5
20291.60.702.5
20301.60.692.5

Brown-headed Nuthatch Survey Routes in Alabama

Routes recording Brown-headed Nuthatch in Alabama.
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 →
Wallsboro1120251971
Liberty City 21120252017
Smyer Lake1020241966
Trade820191966
Citronelle720231998
Drummond620242001
Borden Springs 2520242001
Seale520171998
Eufaula520241998
Dearmanville419831966
Greensport420251966
Brundidge420191969
Mclellan420251966
Blocton420251969
Liberty City420111979
Fairview420251989
Odenville420251996
Calebee420211996
Kymulga420252000
Stevenson420112007
Wedowee420232003
Helicon420231996
Pine Grove320251968
Sunny Eve320251968
Mt Olive320251966

Brown-headed Nuthatch Population Trend in Other States

arkansasdelawarefloridageorgialouisianamarylandmississippinorth-carolinaoklahomasouth-carolinatennesseetexasvirginia

Source: USGS North American Breeding Bird Survey, retrieved 2026-08-14.