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Species · Alabama · BBS 2025 Release · 1966–2024

Brown-headed Nuthatch Population Trend in Alabama

All statesForest birds

Brown-headed Nuthatch in Alabama has held roughly steady: down 5% on the route-weighted index since 1968.

-5%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 →
92Routes 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 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 fall about 21% by 2029 — from 2.0 in 2024 to a central estimate of 1.6 (95% range 0.69–2.5). A 5-year backtest shows a typical error of ±8.6%, with 100% of held-out values landing inside the 95% band.

-21%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 →
1.6Projected 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 →
0.69–2.595% 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 →
±8.6%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 fall about 21% by 2029 — from 2.0 in 2024 to a central estimate of 1.6 (95% range 0.69–2.5). A 5-year backtest shows a typical error of ±8.6%, 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 →
20251.60.732.6
20261.60.722.5
20271.60.712.5
20281.60.702.5
20291.60.692.5

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 →
Cottonton1120241966
Smyer Lake1020241966
Warrior Std1020241966
Trade820191966
Elamville720241984
Citronelle720231998
Mt Olive620241966
Harrell620131972
Talladega620241996
Drummond620242001
Borden Springs 2520242001
Seale520171998
Eufaula520241998
Dearmanville419831966
Sprague420241968
Brundidge420191969
Mclellan420241966
Liberty City420111979
Calebee420211996
Perdido420232022
Liberty City 2420242017
Stevenson420112007
Wedowee420232003
Helicon420231996
Pine Grove320241968

Brown-headed Nuthatch Population Trend in Other States

arkansasdelawarefloridageorgialouisianamarylandmississippinorth-carolinaoklahomasouth-carolinatennesseetexasvirginia

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