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Species · BCR 5 · BBS 2025 Release · 1966–2024

Loggerhead Shrike In Northern Pacific Rainforest

All regionsNorthern Pacific RainforestGeneralists

Loggerhead Shrike in Northern Pacific Rainforest has fallen sharply: down 56% on the route-weighted index since 1976.

-56%Since 1976TrendPercent 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 →
8Routes 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 →
20YearsYears 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 →

No notable trend signals for Loggerhead Shrike in Northern Pacific Rainforest. See the full index history below.

Loggerhead Shrike In Northern Pacific Rainforest Population Forecast

If the recent trend holds, Loggerhead Shrike in Northern Pacific Rainforest is projected to stay roughly flat through 2024, near 0.01 (95% range 0.00–0.05). A 5-year backtest shows a typical error of ±116.8%, with 100% of held-out values landing inside the 95% band.

n/aChange by 2024TrendPercent 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 →
0.01Projected 2024 indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →
0.00–0.0595% 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 →
±116.8%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 Northern Pacific Rainforest is projected to stay roughly flat through 2024, near 0.01 (95% range 0.00–0.05). A 5-year backtest shows a typical error of ±116.8%, with 100% of held-out values landing inside the 95% band.19682024
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 →
20200.010.000.05
20210.010.000.05
20220.010.000.05
20230.010.000.05
20240.010.000.05

Routes In Northern Pacific Rainforest

Routes recording Loggerhead Shrike in Northern Pacific Rainforest.
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 →
HullvilleCALIFORNIA32006
Fish RockCALIFORNIA11968
NavarroCALIFORNIA11974
LongvaleCALIFORNIA11988
Junction CtyCALIFORNIA11977
Mt ShastaCALIFORNIA12012
YrekaCALIFORNIA12015
ScioOREGON12019

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