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

Bendire's Thrasher In Sierra Madre Occidental

All regionsSierra Madre OccidentalGeneralists

Bendire's Thrasher in Sierra Madre Occidental has fallen sharply: down 69% on the route-weighted index since 1979.

-69%Since 1979
11Routes In Region
30Years

Notable Signals

long arc declinecomputed index

Bendire's Thrasher has fallen sharply in Sierra Madre Occidental: down 69% on the route-weighted index since 1979.

Forecast

If the recent trend holds, Bendire's Thrasher in Sierra Madre Occidental is projected to fall about 66% by 2029 — from 0.06 in 2024 to a central estimate of 0.02 (95% range 0.00–0.18). A 5-year backtest shows a typical error of ±73.2%, with 100% of held-out values landing inside the 95% band.

-66%Change by 2029
0.02Projected 2029 index
0.00–0.1895% range
±73.2%Backtest error
19752029
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
20250.030.000.19
20260.030.000.19
20270.030.000.19
20280.020.000.18
20290.020.000.18

Routes In Sierra Madre Occidental

Routes recording Bendire's Thrasher in Sierra Madre Occidental.
San SimonARIZONA32010
Clay SpringARIZONA22014
Carr MtnARIZONA22019
PomereneARIZONA11995
Peña BlancaARIZONA12001
PatagoniaARIZONA12003
RedingtonARIZONA12016
McnealARIZONA12024
Sunizona 2ARIZONA12018
DragoonARIZONA12001
MagdalenaNEW-MEXICO12008

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