BirdAnalyst
Species · BCR 33 · BBS 2025 Release · 1966–2024

California Thrasher In Sonoran and Mojave Deserts

All regionsSonoran and Mojave DesertsGeneralists

California Thrasher in Sonoran and Mojave Deserts has declined: down 29% on the route-weighted index since 1971.

-29%Since 1971
6Routes In Region
45Years

Notable Signals

No notable trend signals for California Thrasher in Sonoran and Mojave Deserts. See the full index history below.

Forecast

If the recent trend holds, California Thrasher in Sonoran and Mojave Deserts is projected to stay roughly flat through 2029, near 0.17 (95% range 0.00–0.34). A 5-year backtest shows a typical error of ±91.7%, with 100% of held-out values landing inside the 95% band.

n/aChange by 2029
0.17Projected 2029 index
0.00–0.3495% range
±91.7%Backtest error
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 index95% low95% high
20250.160.000.34
20260.160.000.34
20270.170.000.34
20280.170.000.34
20290.170.000.34

Routes In Sonoran and Mojave Deserts

Routes recording California Thrasher in Sonoran and Mojave Deserts.
Anza BorregoCALIFORNIA22023
PearblossomCALIFORNIA22018
OnyxCALIFORNIA11998
Calif CityCALIFORNIA11979
Kelso ValleyCALIFORNIA12024
Joshua TreeCALIFORNIA11998

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