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

Loggerhead Shrike Population Trend in Nevada

All statesGeneralists

Loggerhead Shrike in Nevada has declined: down 32% on the route-weighted index since 1970.

-32%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 →
49Routes 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 Loggerhead Shrike Trends in NevadaNotable 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 Nevada. See the full index history below.

Loggerhead Shrike Population Forecast in Nevada

If the recent trend holds, Loggerhead Shrike in Nevada is projected to fall about 50% by 2029 — from 3.9 in 2024 to a central estimate of 1.9 (95% range 0.35–3.5). A 5-year backtest shows a typical error of ±57.3%, with 80% of held-out values landing inside the 95% band.

-50%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 →
1.9Projected 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 →
0.35–3.595% 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 →
±57.3%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 Nevada is projected to fall about 50% by 2029 — from 3.9 in 2024 to a central estimate of 1.9 (95% range 0.35–3.5). A 5-year backtest shows a typical error of ±57.3%, 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 →
20251.90.343.5
20261.90.343.5
20271.90.343.5
20281.90.353.5
20291.90.353.5

Loggerhead Shrike Survey Routes in Nevada

Routes recording Loggerhead Shrike in Nevada.
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 →
Toiyabe Nf3020241988
Majors Place1320241968
Cortez820241968
Ash Meadows720241994
Mizpah620241990
Desert Nwr620241993
Minerva620241988
Sand Pass520241987
Sutcliffe519721968
Beatty520171986
Ruby Valley 2520242012
Virgin Creek520181995
Eureka420241968
Charleston Reservoir420242024
Chimney Res.420232005
Darroughs Hot Spgs420242000
Calico Spr319741969
Midas319961974
Rye Patch319731968
Oreana320032002
Gardnerville 2320242013
Vya219741968
Dinner Sta219931968
Walker Can220241968
Gardnerville220121992

Loggerhead Shrike Population Trend in Other States

alabamaarizonaarkansascaliforniacoloradofloridageorgiaidahoillinoisindianaiowakansaskentuckylouisianamainemarylandmichiganminnesotamississippimissourimontananebraskanew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomaoregonpennsylvaniasouth-carolinasouth-dakotatennesseetexasutahvermontvirginiawashingtonwest-virginiawisconsinwyoming

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