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

Loggerhead Shrike In Sonoran and Mojave Deserts

All regionsSonoran and Mojave DesertsGeneralists

Loggerhead Shrike in Sonoran and Mojave Deserts has collapsed: down 84% on the route-weighted index since 1970.

-84%Since 1970
86Routes In Region
56Years

Notable Signals

long arc declinecomputed index

Loggerhead Shrike has collapsed in Sonoran and Mojave Deserts: down 84% on the route-weighted index since 1970.

Forecast

If the recent trend holds, Loggerhead Shrike in Sonoran and Mojave Deserts is projected to fall about 50% by 2029 — from 2.0 in 2024 to a central estimate of 1.0 (95% range 0.00–5.4). A 5-year backtest shows a typical error of ±32.7%, with 100% of held-out values landing inside the 95% band.

-50%Change by 2029
1.0Projected 2029 index
0.00–5.495% range
±32.7%Backtest error
19682029
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
20251.30.005.7
20261.20.005.6
20271.20.005.5
20281.10.005.4
20291.00.005.4

Routes In Sonoran and Mojave Deserts

Routes recording Loggerhead Shrike in Sonoran and Mojave Deserts.
OnyxCALIFORNIA172015
BlytheCALIFORNIA171979
Squaw PeakARIZONA151970
OatmanARIZONA132019
GoldstoneCALIFORNIA132009
Willow SpgsCALIFORNIA101981
Cabeza PrietARIZONA92024
Valley WellsCALIFORNIA92023
Havasu LakeCALIFORNIA81978
Cibola LakeARIZONA72024
Gila BendARIZONA72024
Bates WellARIZONA72023
Ash MeadowsNEVADA72024
VicksburgARIZONA61989
RivieraARIZONA52024
WickenburgARIZONA52023
BeattyNEVADA52017
Anza BorregoCALIFORNIA42024
Kelso ValleyCALIFORNIA42024
New RiverARIZONA32016
DatelandARIZONA32021
LukevilleARIZONA31980
Hope 2ARIZONA32019
InyokernCALIFORNIA32023
TecopaCALIFORNIA32021

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