BirdAnalyst
Species · BCR 21 · BBS 2025 Release · 1966–2024

Anhinga In Oaks and Prairies

All regionsOaks and PrairiesGeneralists

Anhinga in Oaks and Prairies has declined: down 37% on the route-weighted index since 1973.

-37%Since 1973TrendPercent 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 →
13Routes In RegionSurvey routesHow many standard-protocol BBS routes contributed counts. More routes means a steadier, better-sampled index; very thin coverage is suppressed.Full methodology →
44YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable SignalsNotable 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 Oaks and Prairies. See the full index history below.

Anhinga In Oaks and Prairies Population Forecast

If the recent trend holds, Anhinga in Oaks and Prairies is projected to fall about 47% by 2029 — from 0.06 in 2024 to a central estimate of 0.03 (95% range 0.00–0.12). A 5-year backtest shows a typical error of ±45.5%, with 100% of held-out values landing inside the 95% band.

-47%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 →
0.03Projected 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 →
0.00–0.1295% 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 →
±45.5%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 Oaks and Prairies is projected to fall about 47% by 2029 — from 0.06 in 2024 to a central estimate of 0.03 (95% range 0.00–0.12). A 5-year backtest shows a typical error of ±45.5%, with 100% of held-out values landing inside the 95% band.19702029
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 →
20250.040.000.12
20260.040.000.12
20270.040.000.12
20280.040.000.12
20290.030.000.12

Routes In Oaks and Prairies

Routes recording Anhinga in Oaks and Prairies.
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 →
Massey LakeTEXAS22024
BonnerTEXAS22017
CampbelltonTEXAS12010
LockhartTEXAS12003
Oak GroveTEXAS11984
OakwoodTEXAS11979
OlaTEXAS12024
DikeTEXAS12012
Oak Grove 2TEXAS12021
CayugaTEXAS12016
CarlosTEXAS12018
Mount ZionTEXAS11998
CreedmoreTEXAS12005

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