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

Ring-billed Gull Population Trend in Wyoming

All statesWetland birds

Ring-billed Gull in Wyoming has surged: up 645% on the route-weighted index since 1979.

+645%Since 1979TrendPercent 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 →
28Routes 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 →
36YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Ring-billed Gull 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 →

Ring-billed Gull has surged in Wyoming: up 645% on the route-weighted index since 1979.

Ring-billed Gull Population Forecast in Wyoming

If the recent trend holds, Ring-billed Gull in Wyoming is projected to rise about 145% by 2029 — from 0.25 in 2024 to a central estimate of 0.61 (95% range 0.00–1.5). A 5-year backtest shows a typical error of ±549%, with 80% of held-out values landing inside the 95% band.

+145%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 →
0.61Projected 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 →
0.00–1.595% 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 →
±549%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, Ring-billed Gull in Wyoming is projected to rise about 145% by 2029 — from 0.25 in 2024 to a central estimate of 0.61 (95% range 0.00–1.5). A 5-year backtest shows a typical error of ±549%, with 80% of held-out values landing inside the 95% band.19762029
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 →
20250.570.001.4
20260.580.001.5
20270.590.001.5
20280.600.001.5
20290.610.001.5

Ring-billed Gull Survey Routes in Wyoming

Routes recording Ring-billed Gull 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 →
Midvale2920222017
Yoder2120041981
Rawlins1419991993
Harmony1220221987
Mtn View1019801980
Carter 2920212018
Green River919821977
Fontenelle820241982
Upton720242024
Cumberland519791979
Mckinnon519831976
Flamin Gorge320242024
Colter Bay219891989
Brookhurst220151997
Dwyer219941994
Sybille Cyn220242024
Otto120242024
Yellowstone120131989
Ervay120112011
Hunter Peak119941994
Alpine120241990
Ethete120221991
Fiddler Lk120012001
Sand Draw120192013
Caballa Crk120212021

Ring-billed Gull Population Trend in Other States

alabamaarizonacaliforniacoloradoconnecticutdelawarefloridageorgiaidahoillinoisindianaiowakansaskentuckylouisianamainemarylandmassachusettsmichiganminnesotamissourimontananebraskanevadanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomaoregonpennsylvaniarhode-islandsouth-carolinasouth-dakotatexasutahvermontvirginiawashingtonwest-virginiawisconsin

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