BirdAnalyst
Species · BCR 34 · BBS 2025 Release · 1966–2024

Brewer's Sparrow In Sierra Madre Occidental

All regionsSierra Madre OccidentalGeneralists

Brewer's Sparrow in Sierra Madre Occidental has collapsed: down 96% on the route-weighted index since 1989.

-96%Since 1989
5Routes In Region
16Years

Notable Signals

long arc declinecomputed index

Brewer's Sparrow has collapsed in Sierra Madre Occidental: down 96% on the route-weighted index since 1989.

Routes In Sierra Madre Occidental

Routes recording Brewer's Sparrow in Sierra Madre Occidental.
PomereneARIZONA101974
SunizonaARIZONA91988
Skull ValleyARIZONA12021
PinetopARIZONA12018
Clay SpringARIZONA12024

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