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

Anhinga Population Trend in Alabama

All statesWetland birds

Anhinga in Alabama has held roughly steady: up 6% on the route-weighted index since 1978.

+6%Since 1978TrendPercent 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 →
21Routes 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 →
32YearsYears 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 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 Anhinga in Alabama. See the full index history below.

Anhinga Population Forecast in Alabama

If the recent trend holds, Anhinga in Alabama is projected to rise about 10% by 2030 — from 0.06 in 2025 to a central estimate of 0.07 (95% range 0.00–0.14). A 5-year backtest shows a typical error of ±42%, with 100% of held-out values landing inside the 95% band.

+10%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 →
0.07Projected 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 →
0.00–0.1495% 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 →
±42%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 Alabama is projected to rise about 10% by 2030 — from 0.06 in 2025 to a central estimate of 0.07 (95% range 0.00–0.14). A 5-year backtest shows a typical error of ±42%, with 100% of held-out values landing inside the 95% band.19722030
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 →
20260.060.000.14
20270.060.000.14
20280.060.000.14
20290.060.000.14
20300.070.000.14

Anhinga Survey Routes in Alabama

Routes recording Anhinga 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 →
Lanett620222022
Madrid420191994
Wallsboro220041999
Jena220252025
Fairview220241992
Harrell119861972
Greensboro120002000
Billingsley120172017
Newton119981998
Grangeburg120161978
Brundidge120152015
Brantley120232023
Mclellan120092009
Castleberry120252025
Millry120012001
Elamville120082008
Calebee120192019
Helicon120242024
St. Elmo120172017
Gainestown Ferry120091999
Chacaloochee Bay120192009

Anhinga Population Trend in Other States

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