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Species · BCR 23 · BBS 2025 Release · 1966–2024

Loggerhead Shrike In Prairie Hardwood Transition

All regionsPrairie Hardwood TransitionGeneralists

Loggerhead Shrike in Prairie Hardwood Transition has collapsed: down 88% on the route-weighted index since 1968.

-88%Since 1968TrendPercent 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 →
26Routes In RegionSurvey routesHow many standard-protocol BBS routes contributed counts. More routes means a steadier, better-sampled index; very thin coverage is suppressed.Full methodology →
23YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable SignalsNotable 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 declinecomputed 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 →

Loggerhead Shrike has collapsed in Prairie Hardwood Transition: down 88% on the route-weighted index since 1968.

Loggerhead Shrike In Prairie Hardwood Transition Population Forecast

If the recent trend holds, Loggerhead Shrike in Prairie Hardwood Transition is projected to stay roughly flat through 2014, near 0.00 (95% range 0.00–0.10). A 5-year backtest shows a typical error of ±395.4%, with 100% of held-out values landing inside the 95% band.

n/aChange by 2014TrendPercent 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 →
0.00Projected 2014 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 →
±395.4%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 Prairie Hardwood Transition is projected to stay roughly flat through 2014, near 0.00 (95% range 0.00–0.10). A 5-year backtest shows a typical error of ±395.4%, with 100% of held-out values landing inside the 95% band.19662014
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 →
20100.000.000.10
20110.000.000.10
20120.000.000.10
20130.000.000.10
20140.000.000.10

Routes In Prairie Hardwood Transition

Routes recording Loggerhead Shrike in Prairie Hardwood Transition.
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 →
PrattvilleMICHIGAN31969
ChatfieldMINNESOTA21969
PrincetonMINNESOTA21976
CascoWISCONSIN21999
GuilfordILLINOIS11990
CoopersvilleMICHIGAN12009
AdrianMICHIGAN11966
JuniataMICHIGAN11967
PettysvilleMICHIGAN11978
Allegan WmaMICHIGAN12002
OsseoMINNESOTA11994
KnappMINNESOTA11999
EdwardsMINNESOTA11979
EvergreenMINNESOTA11968
Le CenterMINNESOTA11996
GlenwoodMINNESOTA12005
GraytownOHIO11971
BismarkOHIO11972
DresserWISCONSIN11969
LoraineWISCONSIN11968
ManawaWISCONSIN11994
N FreedomWISCONSIN11978
PardeevilleWISCONSIN11969
Fall RiverWISCONSIN11969
Pt WashingtnWISCONSIN11972

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