BirdAnalyst
Species · Georgia · BBS 2026 Release · 1966–2025

Anhinga Population Trend in Georgia

All statesWetland birds

Anhinga in Georgia has declined: down 45% on the route-weighted index since 1968.

-45%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 →
54Routes 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 →
54YearsYears 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 GeorgiaNotable 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 Georgia. See the full index history below.

Anhinga Population Forecast in Georgia

If the recent trend holds, Anhinga in Georgia is projected to rise about 63% by 2030 — from 0.20 in 2025 to a central estimate of 0.32 (95% range 0.00–0.80). A 5-year backtest shows a typical error of ±34.1%, with 100% of held-out values landing inside the 95% band.

+63%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 →
0.32Projected 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 →
0.00–0.8095% 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 →
±34.1%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 Georgia is projected to rise about 63% by 2030 — from 0.20 in 2025 to a central estimate of 0.32 (95% range 0.00–0.80). A 5-year backtest shows a typical error of ±34.1%, 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 →
20260.310.000.79
20270.310.000.79
20280.320.000.80
20290.320.000.80
20300.320.000.80

Anhinga Survey Routes in Georgia

Routes recording Anhinga in Georgia.
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 →
Darien3620191966
Riceboro1420062006
Owensboro1020232012
Newton420241977
Ousley420252015
Fitzgerald320251985
Weber320242013
Pineora320171994
Harrietts Bl220231992
Baxley220191967
Wrightsville220152015
Hawkinsville220241976
Doles220191998
Lacross219991989
Glenmore220162016
Okefenokee119751975
Stockton120231979
Fowlstown120151976
Everett City120181976
Cuthbert120251974
Guyton119931983
Nashville120241975
Cartersville119821982
Henderson120252007
Coffee Co120211993

Anhinga Population Trend in Other States

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