BirdAnalyst
Species · BCR 32 · BBS 2025 Release · 1966–2024

Western Screech-Owl In Coastal California

All regionsCoastal CaliforniaGeneralists

Western Screech-Owl in Coastal California has declined: down 26% on the route-weighted index since 1974.

-26%Since 1974TrendPercent 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 →
36YearsYears 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 Western Screech-Owl in Coastal California. See the full index history below.

Western Screech-Owl In Coastal California Population Forecast

If the recent trend holds, Western Screech-Owl in Coastal California is projected to stay roughly flat through 2029, near 0.02 (95% range 0.00–0.06). A 5-year backtest shows a typical error of ±15.5%, with 100% of held-out values landing inside the 95% band.

n/aChange 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 →
0.02Projected 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 →
0.00–0.0695% 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 →
±15.5%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, Western Screech-Owl in Coastal California is projected to stay roughly flat through 2029, near 0.02 (95% range 0.00–0.06). A 5-year backtest shows a typical error of ±15.5%, with 100% of held-out values landing inside the 95% band.19692029
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 →
20250.020.000.06
20260.020.000.06
20270.020.000.06
20280.020.000.06
20290.020.000.06

Routes In Coastal California

Routes recording Western Screech-Owl in Coastal California.
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 →
Mesa GrandeCALIFORNIA21995
AdelaidaCALIFORNIA21981
Cal Hot SpgsCALIFORNIA22012
Red BluffCALIFORNIA12017
RumseyCALIFORNIA11985
Mt PinosCALIFORNIA11983
Lake SuccessCALIFORNIA11976
Morro BayCALIFORNIA11977
FairfaxCALIFORNIA11988
Sawmill MtnCALIFORNIA11981
TujungaCALIFORNIA11986
El ToroCALIFORNIA11979
Carmel ValCALIFORNIA11978
Lake CachumaCALIFORNIA12013
Gold HillCALIFORNIA12023
ReddingCALIFORNIA11979
MoragaCALIFORNIA12004
Yolla BollyCALIFORNIA12005
Mark WestCALIFORNIA11995
CoyoteCALIFORNIA12017
CopperopolisCALIFORNIA12013
OnealsCALIFORNIA12024
Waterman GapCALIFORNIA12002
GreenfieldCALIFORNIA12021
Glen Ellen 2CALIFORNIA12022

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