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

Anhinga Population Trend in Florida

All statesGeneralists

Anhinga in Florida has edged down: down 14% on the route-weighted index since 1968.

-14%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 →
95Routes 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 Anhinga Trends in FloridaNotable 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 Florida. See the full index history below.

Anhinga Population Forecast in Florida

If the recent trend holds, Anhinga in Florida is projected to rise about 91% by 2029 — from 0.63 in 2024 to a central estimate of 1.2 (95% range 0.04–2.4). A 5-year backtest shows a typical error of ±74.9%, with 100% of held-out values landing inside the 95% band.

+91%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 →
1.2Projected 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 →
0.04–2.495% 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 →
±74.9%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 Florida is projected to rise about 91% by 2029 — from 0.63 in 2024 to a central estimate of 1.2 (95% range 0.04–2.4). A 5-year backtest shows a typical error of ±74.9%, 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 →
20251.20.042.4
20261.20.042.4
20271.20.042.4
20281.20.042.4
20291.20.042.4

Anhinga Survey Routes in Florida

Routes recording Anhinga in Florida.
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 →
Shawano6820021987
Wildernes Pk1920141992
Pinecrest1320241966
Shawano 21220112004
Winter Gardn1020191987
Mabel 2820192012
Boca Raton619941970
Andytown619981974
Deanville620191987
Sandy620151987
Lovedale620111987
Merritt Isl620061991
Dale Mabry519871969
Davie520171987
Holey Land520231987
Babcock Rnch519891988
Micanopy419781966
Romeo420231966
Blackwater419891989
Ft Mccoy320031994
St Lucie320241987
Aripeka320231987
Clewiston320232015
Webb320241992
Broad Branch220231971

Anhinga Population Trend in Other States

alabamaarkansasgeorgialouisianamississippinorth-carolinaoklahomasouth-carolinatexasvirginia

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