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

Blue-winged Teal In Oaks and Prairies

All regionsOaks and PrairiesWaterfowl

Blue-winged Teal in Oaks and Prairies has collapsed: down 78% on the route-weighted index since 1970.

-78%Since 1970TrendPercent 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 →
20YearsYears 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 →

long arc declinecomputed indexTrend sourceWhether the figure is our own computed route-weighted index or an official USGS modeled estimate. The current build labels every trend as computed.Full methodology →

Blue-winged Teal has collapsed in Oaks and Prairies: down 78% on the route-weighted index since 1970.

Blue-winged Teal In Oaks and Prairies Population Forecast

If the recent trend holds, Blue-winged Teal in Oaks and Prairies is projected to stay roughly flat through 2026, near 0.04 (95% range 0.00–0.19). A 5-year backtest shows a typical error of ±113.6%, with 100% of held-out values landing inside the 95% band.

n/aChange by 2026TrendPercent 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 →
0.04Projected 2026 indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →
0.00–0.1995% 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 →
±113.6%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, Blue-winged Teal in Oaks and Prairies is projected to stay roughly flat through 2026, near 0.04 (95% range 0.00–0.19). A 5-year backtest shows a typical error of ±113.6%, with 100% of held-out values landing inside the 95% band.19672026
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 →
20220.040.000.20
20230.040.000.20
20240.040.000.19
20250.040.000.19
20260.040.000.19

Routes In Oaks and Prairies

Routes recording Blue-winged Teal 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 →
Glen RoseTEXAS91968
SadlerTEXAS42011
FanninTEXAS32007
BeggsOKLAHOMA22017
Gambill Ref.TEXAS22021
LocoOKLAHOMA11972
CampbelltonTEXAS12013
Lone OakTEXAS11968
WeatherfordTEXAS11973
GrafordTEXAS12000
CottonwoodTEXAS12016
HenriettaTEXAS11993
HearneTEXAS12011

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