Species · BCR 34 · BBS 2025 Release · 1966–2024
Black-bellied Whistling-Duck In Sierra Madre Occidental
Black-bellied Whistling-Duck in Sierra Madre Occidental has fallen sharply: down 50% on the route-weighted index since 1989.
-50%Since 1989
3Routes In Region
16Years
Notable Signals
long arc declinecomputed index
Black-bellied Whistling-Duck has fallen sharply in Sierra Madre Occidental: down 50% on the route-weighted index since 1989.
Routes In Sierra Madre Occidental
| Peña Blanca | ARIZONA | 2 | 1997 |
| Amado | ARIZONA | 2 | 2014 |
| Patagonia | ARIZONA | 1 | 2012 |
Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.