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

Eared Grebe Population Trend in Wyoming

All statesWetland birds

Eared Grebe in Wyoming has surged: up 390% on the route-weighted index since 1976.

+390%Since 1976TrendPercent 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 →
32Routes 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 →
45YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Eared Grebe 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 →

long arc increasecomputed 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 →

Eared Grebe has surged in Wyoming: up 390% on the route-weighted index since 1976.

Eared Grebe Population Forecast in Wyoming

If the recent trend holds, Eared Grebe in Wyoming is projected to fall about 59% by 2030 — from 1.4 in 2025 to a central estimate of 0.58 (95% range 0.01–1.2). A 5-year backtest shows a typical error of ±72.7%, with 40% of held-out values landing inside the 95% band.

-59%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 →
0.58Projected 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 →
0.01–1.295% 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 →
±72.7%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, Eared Grebe in Wyoming is projected to fall about 59% by 2030 — from 1.4 in 2025 to a central estimate of 0.58 (95% range 0.01–1.2). A 5-year backtest shows a typical error of ±72.7%, with 40% of held-out values landing inside the 95% band.19712030
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 →
20260.540.001.1
20270.550.001.1
20280.560.001.1
20290.570.001.2
20300.580.011.2

Eared Grebe Survey Routes in Wyoming

Routes recording Eared Grebe 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 →
Yellowstone12720242003
Carter 210520252021
Brookhurst2020221980
Rawlins 21320252016
Harmony1320222022
Rock River1120221993
Mammoth720161999
Anchor620162016
Lamont419911991
Mtn View420251981
Kaycee420252024
Fontenelle320252025
Welch319951980
Ervay220222022
Seely 2220072007
Mckinnon219821976
Yoder220252025
Horse Creek220252000
Fiddler Lk220041982
Pathfinder220251982
Bucknum220011993
Green River219811978
Rawlins220062006
Walcott219921992
Patrick Draw 2219821982

Eared Grebe Population Trend in Other States

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