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

Great-tailed Grackle In Sierra Madre Occidental

All regionsSierra Madre OccidentalGeneralists

Great-tailed Grackle in Sierra Madre Occidental has collapsed: down 89% on the route-weighted index since 1973.

-89%Since 1973
17Routes In Region
53Years

Notable Signals

long arc declinecomputed index

Great-tailed Grackle has collapsed in Sierra Madre Occidental: down 89% on the route-weighted index since 1973.

Forecast

If the recent trend holds, Great-tailed Grackle in Sierra Madre Occidental is projected to fall about 32% by 2029 — from 0.83 in 2024 to a central estimate of 0.56 (95% range 0.00–3.9). A 5-year backtest shows a typical error of ±44%, with 100% of held-out values landing inside the 95% band.

-32%Change by 2029
0.56Projected 2029 index
0.00–3.995% range
±44%Backtest error
19702029
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
20250.680.004.0
20260.650.004.0
20270.620.003.9
20280.590.003.9
20290.560.003.9

Routes In Sierra Madre Occidental

Routes recording Great-tailed Grackle in Sierra Madre Occidental.
PomereneARIZONA102024
PinetopARIZONA42003
AmadoARIZONA42023
Carr MtnARIZONA42021
Skull ValleyARIZONA32024
CutterARIZONA32014
PrescottARIZONA22021
Peña BlancaARIZONA21992
RedingtonARIZONA22010
San SimonARIZONA11983
PatagoniaARIZONA12024
SunizonaARIZONA11996
WilliamsARIZONA12006
Bartlett ResARIZONA12023
SahuaritaARIZONA12018
McnealARIZONA12024
Sunizona 2ARIZONA12014

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