BirdAnalyst
Species · South Carolina · BBS 2025 Release · 1966–2024

Brown-headed Nuthatch Population Trend in South Carolina

All statesForest birds

Brown-headed Nuthatch in South Carolina has increased: up 26% on the route-weighted index since 1968.

+26%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 →
49Routes 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 South CarolinaNotable 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 South Carolina. See the full index history below.

Brown-headed Nuthatch Population Forecast in South Carolina

If the recent trend holds, Brown-headed Nuthatch in South Carolina is projected to fall about 24% by 2029 — from 4.0 in 2024 to a central estimate of 3.1 (95% range 0.43–5.7). A 5-year backtest shows a typical error of ±14.8%, with 100% of held-out values landing inside the 95% band.

-24%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 →
3.1Projected 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 →
0.43–5.795% 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 →
±14.8%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 South Carolina is projected to fall about 24% by 2029 — from 4.0 in 2024 to a central estimate of 3.1 (95% range 0.43–5.7). A 5-year backtest shows a typical error of ±14.8%, 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 →
20253.10.465.7
20263.10.465.7
20273.10.455.7
20283.10.445.7
20293.10.435.7

Brown-headed Nuthatch Survey Routes in South Carolina

Routes recording Brown-headed Nuthatch in South Carolina.
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 →
Little Mtn1919881966
Plum Branch1620241977
Sandhills1620241994
Salem Xrd1120191982
Pinewood920191999
Whitmire820242010
Mount Pisgah820211998
Adams Run720241988
Campobello620242010
Rome520241967
New Holland520241967
Ward520212017
Carvers Bay520121998
Kiawah Island520241999
Battlecreek520222002
Prosperity520241992
Owings419971995
Salem420242010
Joanna420221999
Red Bluff420232017
Wagener320181966
Boykin Ml Pd319681966
Boiling Spgs319751967
Greenwood320181998
Bennettsville320141999

Brown-headed Nuthatch Population Trend in Other States

alabamaarkansasdelawarefloridageorgialouisianamarylandmississippinorth-carolinaoklahomatennesseetexasvirginia

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