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

Loggerhead Shrike Population Trend in Wyoming

All statesGrassland birds

Loggerhead Shrike in Wyoming has edged up: up 16% on the route-weighted index since 1970.

+16%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 →
99Routes 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 →
57YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Loggerhead Shrike 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 Loggerhead Shrike in Wyoming. See the full index history below.

Loggerhead Shrike Population Forecast in Wyoming

If the recent trend holds, Loggerhead Shrike in Wyoming is projected to fall about 55% by 2030 — from 1.5 in 2025 to a central estimate of 0.69 (95% range 0.00–1.5). A 5-year backtest shows a typical error of ±62.3%, with 60% of held-out values landing inside the 95% band.

-55%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 →
0.69Projected 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 →
0.00–1.595% 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 →
±62.3%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, Loggerhead Shrike in Wyoming is projected to fall about 55% by 2030 — from 1.5 in 2025 to a central estimate of 0.69 (95% range 0.00–1.5). A 5-year backtest shows a typical error of ±62.3%, with 60% of held-out values landing inside the 95% band.19682030
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 →
20260.730.001.6
20270.720.001.6
20280.710.001.5
20290.700.001.5
20300.690.001.5

Loggerhead Shrike Survey Routes in Wyoming

Routes recording Loggerhead Shrike 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 →
Thunder Basin1520252012
Newcastle1420251988
Arminto1020251982
Upton820251988
Reliance820251977
Chugwater820241979
Schoonover720251982
Teapot Dome719891982
Riverview720251983
Baggs720251995
Redbird619891968
Flamin Gorge620242003
Gas Hills520121992
Shawnee520251988
Sybille Cyn520251993
Wyarno420251974
Tensleep420251998
Raven420251992
Rawlins420141992
Carter 2420242017
Natrona319921968
Bill320181974
Ervay320251974
Recluse320221981
Piney319891989

Loggerhead Shrike Population Trend in Other States

alabamaarizonaarkansascaliforniacoloradofloridageorgiaidahoillinoisindianaiowakansaskentuckylouisianamainemarylandmichiganminnesotamississippimissourimontananebraskanevadanew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomaoregonpennsylvaniasouth-carolinasouth-dakotatennesseetexasutahvermontvirginiawashingtonwest-virginiawisconsin

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