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

Loggerhead Shrike Population Trend in Wyoming

All statesGeneralists

Loggerhead Shrike in Wyoming has edged up: up 11% on the route-weighted index since 1970.

+11%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 →
56YearsYears 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 61% by 2029 — from 1.7 in 2024 to a central estimate of 0.64 (95% range 0.00–1.5). A 5-year backtest shows a typical error of ±54.6%, with 80% of held-out values landing inside the 95% band.

-61%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 →
0.64Projected 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 →
±54.6%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, Loggerhead Shrike in Wyoming is projected to fall about 61% by 2029 — from 1.7 in 2024 to a central estimate of 0.64 (95% range 0.00–1.5). A 5-year backtest shows a typical error of ±54.6%, with 80% 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 →
20250.690.001.5
20260.680.001.5
20270.670.001.5
20280.650.001.5
20290.640.001.5

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 →
Newcastle1220241988
Upton1020241988
Arminto1020241982
Schoonover920241982
Baggs920241995
Chugwater820241979
Teapot Dome719891982
Reliance720181977
Sybille Cyn720241993
Redbird619891968
Shawnee620241988
Flamin Gorge620242003
Frannie520232002
Arvada520241982
Sussex520241991
Gas Hills520121992
Wamsutter520241993
Rawlins 2520232015
Clark420242009
Riverview420221983
Rawlins420141992
Carter 2420242017
Natrona319921968
Bill320181974
Bear Creek320181969

Loggerhead Shrike Population Trend in Other States

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

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