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

Anhinga Population Trend in North Carolina

All statesGeneralists

Anhinga in North Carolina has edged down: down 23% on the route-weighted index since 1999.

-23%Since 1999TrendPercent 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 →
17Routes 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 →
26YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Anhinga Trends in North 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 Anhinga in North Carolina. See the full index history below.

Anhinga Population Forecast in North Carolina

If the recent trend holds, Anhinga in North Carolina is projected to rise about 53% by 2029 — from 0.10 in 2024 to a central estimate of 0.15 (95% range 0.00–0.39). A 5-year backtest shows a typical error of ±91%, with 60% of held-out values landing inside the 95% band.

+53%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 →
0.15Projected 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 →
0.00–0.3995% 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 →
±91%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, Anhinga in North Carolina is projected to rise about 53% by 2029 — from 0.10 in 2024 to a central estimate of 0.15 (95% range 0.00–0.39). A 5-year backtest shows a typical error of ±91%, with 60% of held-out values landing inside the 95% band.19932029
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 →
20250.140.000.38
20260.140.000.39
20270.150.000.39
20280.150.000.39
20290.150.000.39

Anhinga Survey Routes in North Carolina

Routes recording Anhinga in North 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 →
Speed220242002
Genoa220242001
Dortches120242002
Myrtle Grove120241993
Wards Corner120232000
Hallsboro120172015
Supply120241999
Cayton120222021
Sheep Ridge120172017
Broad Creek120142014
Kinston120221998
Rowland120132013
Maple Hill120232013
Montague120212018
Rheasville120112011
Bethel120212010
Cypress Lakes120062006

Anhinga Population Trend in Other States

alabamaarkansasfloridageorgialouisianamississippioklahomasouth-carolinatexasvirginia

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