Species · BCR 15 · BBS 2025 Release · 1966–2024
Black Swift In Sierra Nevada
Black Swift in Sierra Nevada has collapsed: down 86% on the route-weighted index since 1977.
-86%Since 1977
7Routes In Region
14Years
Notable Signals
long arc declinecomputed index
Black Swift has collapsed in Sierra Nevada: down 86% on the route-weighted index since 1977.
Routes In Sierra Nevada
| Bass Lake | CALIFORNIA | 1 | 2008 |
| Silver City | CALIFORNIA | 1 | 1980 |
| Kings Canyon | CALIFORNIA | 1 | 2004 |
| Hat Creek | CALIFORNIA | 1 | 2004 |
| Lakeshore | CALIFORNIA | 1 | 1987 |
| Coulterville | CALIFORNIA | 1 | 1998 |
| Kernville | CALIFORNIA | 1 | 2008 |
Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.