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

Loggerhead Shrike Population Trend in Indiana

All statesGeneralists

Loggerhead Shrike in Indiana has declined: down 45% on the route-weighted index since 1980.

-45%Since 1980TrendPercent 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 →
10Routes 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 →
19YearsYears 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 IndianaNotable 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 Indiana. See the full index history below.

Loggerhead Shrike Population Forecast in Indiana

If the recent trend holds, Loggerhead Shrike in Indiana is projected to stay roughly flat through 2015, near 0.04 (95% range 0.00–0.10). A 5-year backtest shows a typical error of ±170.1%, with 40% of held-out values landing inside the 95% band.

n/aChange by 2015TrendPercent 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 →
0.04Projected 2015 indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →
0.00–0.1095% 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 →
±170.1%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 Indiana is projected to stay roughly flat through 2015, near 0.04 (95% range 0.00–0.10). A 5-year backtest shows a typical error of ±170.1%, with 40% of held-out values landing inside the 95% band.19662015
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 →
20110.040.000.10
20120.040.000.10
20130.040.000.10
20140.040.000.10
20150.040.000.10

Loggerhead Shrike Survey Routes in Indiana

Routes recording Loggerhead Shrike in Indiana.
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 →
Cumback219961981
Shelbyville219831983
Washington119911987
Millersburg119811981
Indian Spgs120102009
Celestine119951980
New Phila119891984
Corydon119741974
Fowler119921966
Milroy119881988

Loggerhead Shrike Population Trend in Other States

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

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