BirdAnalyst
Species · Georgia · BBS 2025 Release · 1966–2024

Anhinga Population Trend in Georgia

All statesGeneralists

Anhinga in Georgia has declined: down 27% on the route-weighted index since 1968.

-27%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 →
53YearsYears 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 fall about 28% by 2029 — from 0.46 in 2024 to a central estimate of 0.33 (95% range 0.00–0.81). A 5-year backtest shows a typical error of ±43.2%, with 80% of held-out values landing inside the 95% band.

-28%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 →
0.33Projected 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 →
0.00–0.8195% 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 →
±43.2%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 fall about 28% by 2029 — from 0.46 in 2024 to a central estimate of 0.33 (95% range 0.00–0.81). A 5-year backtest shows a typical error of ±43.2%, with 80% 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 →
20250.320.000.80
20260.320.000.80
20270.320.000.81
20280.330.000.81
20290.330.000.81

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
Shiloh420242012
Fitzgerald320241985
Weber320242013
Pineora320171994
Harrietts Bl220231992
Baxley220191967
Wrightsville220152015
Hawkinsville220241976
Henderson220242007
Doles220191998
Lacross219991989
Tarver219971997
Glenmore220162016
Okefenokee119751975
Stockton120231979
Fowlstown120151976
Everett City120181976
Cuthbert120221974
Guyton119931983
Nashville120241975
Cartersville119821982

Anhinga Population Trend in Other States

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