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

Loggerhead Shrike In Coastal California

All regionsCoastal CaliforniaGeneralists

Loggerhead Shrike in Coastal California has collapsed: down 85% on the route-weighted index since 1970.

-85%Since 1970
89Routes In Region
56Years

Notable Signals

long arc declinecomputed index

Loggerhead Shrike has collapsed in Coastal California: down 85% on the route-weighted index since 1970.

Forecast

If the recent trend holds, Loggerhead Shrike in Coastal California is projected to fall about 84% by 2029 — from 0.98 in 2024 to a central estimate of 0.16 (95% range 0.00–2.5). A 5-year backtest shows a typical error of ±53.7%, with 100% of held-out values landing inside the 95% band.

-84%Change by 2029
0.16Projected 2029 index
0.00–2.595% range
±53.7%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
20250.390.002.7
20260.330.002.6
20270.270.002.6
20280.210.002.5
20290.160.002.5

Routes In Coastal California

Routes recording Loggerhead Shrike in Coastal California.
ShafterCALIFORNIA181989
TranquillityCALIFORNIA162004
AtwaterCALIFORNIA142012
RiovistaCALIFORNIA112024
VentucopaCALIFORNIA112002
Buena VistaCALIFORNIA72019
S CatalinaCALIFORNIA62019
MaricopaCALIFORNIA62024
Hollister 2CALIFORNIA62024
HollisterCALIFORNIA52011
Elizabeth LkCALIFORNIA51984
Carrizo PlnCALIFORNIA52023
Ora LomaCALIFORNIA52024
Cal Hot SpgsCALIFORNIA51994
Tracy 2CALIFORNIA52024
ColmaCALIFORNIA41968
MorenoCALIFORNIA42024
AuburnCALIFORNIA41980
PowayCALIFORNIA41980
SangerCALIFORNIA42023
Green ValleyCALIFORNIA42017
Lake Hemet 2CALIFORNIA41993
Tres Pinos 2CALIFORNIA42011
RumseyCALIFORNIA32007
HughsonCALIFORNIA32024

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