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Species · Wyoming · BBS 2025 Release · 1966–2024

Green-winged Teal Population Trend in Wyoming

All statesWaterfowl

Green-winged Teal in Wyoming has declined: down 47% on the route-weighted index since 1971.

-47%Since 1971TrendPercent 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 →
78Routes 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 →
54YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Green-winged Teal Trends in WyomingNotable 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 Green-winged Teal in Wyoming. See the full index history below.

Green-winged Teal Population Forecast in Wyoming

If the recent trend holds, Green-winged Teal in Wyoming is projected to fall about 63% by 2029 — from 0.21 in 2024 to a central estimate of 0.08 (95% range 0.00–0.55). A 5-year backtest shows a typical error of ±150.6%, with 100% of held-out values landing inside the 95% band.

-63%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 →
0.08Projected 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 →
0.00–0.5595% 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 →
±150.6%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, Green-winged Teal in Wyoming is projected to fall about 63% by 2029 — from 0.21 in 2024 to a central estimate of 0.08 (95% range 0.00–0.55). A 5-year backtest shows a typical error of ±150.6%, with 100% of held-out values landing inside the 95% band.19682029
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 →
20250.110.000.58
20260.100.000.58
20270.090.000.57
20280.090.000.56
20290.080.000.55

Green-winged Teal Survey Routes in Wyoming

Routes recording Green-winged Teal in Wyoming.
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 →
Harmony1220221980
Moose919931976
Rawlins919931989
Nowood820241988
Patrick Draw 2819821982
Caballa Crk719921992
Bill520002000
Clark520012001
Daniel519881984
Green River519811977
Hayden Val519861985
Patrick Draw419801978
Yoder420151980
Soda Well419941988
Mayoworth420182018
Gas Hills419931991
Shirley420082008
Bucknum420071993
Yellowstone420211987
Ne Entrance320191982
Ervay320242019
Crazy Woman320141980
Piney319871980
Pine Bluff320181990
Cody220092009

Green-winged Teal Population Trend in Other States

alaskaarizonacaliforniacoloradoidahoillinoisindianaiowakansasmainemichiganminnesotamissourimontananebraskanevadanew-hampshirenew-mexiconew-yorknorth-dakotaoklahomaoregonpennsylvaniasouth-dakotatexasutahvermontwashingtonwisconsin

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