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

Brewer's Blackbird In Sonoran and Mojave Deserts

All regionsSonoran and Mojave DesertsGeneralists

Brewer's Blackbird in Sonoran and Mojave Deserts has collapsed: down 97% on the route-weighted index since 1970.

-97%Since 1970
32Routes In Region
56Years

Notable Signals

long arc declinecomputed index

Brewer's Blackbird has collapsed in Sonoran and Mojave Deserts: down 97% on the route-weighted index since 1970.

Forecast

If the recent trend holds, Brewer's Blackbird in Sonoran and Mojave Deserts is projected to fall about 100% by 2029 — from 0.53 in 2024 to a central estimate of 0.00 (95% range 0.00–5.2). A 5-year backtest shows a typical error of ±729.5%, with 100% of held-out values landing inside the 95% band.

-100%Change by 2029
0.00Projected 2029 index
0.00–5.295% range
±729.5%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
20250.000.005.2
20260.000.005.2
20270.000.005.2
20280.000.005.2
20290.000.005.2

Routes In Sonoran and Mojave Deserts

Routes recording Brewer's Blackbird in Sonoran and Mojave Deserts.
OnyxCALIFORNIA542015
Willow SpgsCALIFORNIA521981
Parker DamCALIFORNIA222007
Alamo RiverCALIFORNIA202018
Imperial DamCALIFORNIA201973
Kelso ValleyCALIFORNIA72024
Casa GrandeARIZONA61991
LagunaARIZONA51984
Anza BorregoCALIFORNIA52012
Coachella CnCALIFORNIA52000
Ft IrwinCALIFORNIA51975
Silver PeakNEVADA51974
FlorenceARIZONA41972
GlamisCALIFORNIA42017
InyokernCALIFORNIA31992
NilandCALIFORNIA32024
CadizCALIFORNIA21991
Palo VerdeCALIFORNIA22022
Lucerne ValCALIFORNIA21997
PearblossomCALIFORNIA22024
Lone PineCALIFORNIA22024
Death ValleyCALIFORNIA21980
Joshua TreeCALIFORNIA22000
BrawleyCALIFORNIA22009
BeattyNEVADA22024

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