Lone wolf M633 dies in Swiss road collision after livestock attacks

A lone male wolf, identified as M633, has died after being struck by a vehicle in Schwyz. The animal, first identified in September 2025, was linked to attacks on livestock in the region, including the killing of two sheep near Trachslau and attacks on wildlife in Alpthal. The fully grown male, aged between two and three, was not part of any established Swiss wolf pack. An examination after its death revealed no gunshot wounds, ruling out illegal hunting. Instead, the collision with a vehicle was confirmed as the cause of death.

As of early 2026, Switzerland officially recognizes four wolf packs. These include the Sihl pack in Zurich, the Jura pack in Jura, the Calanda pack in Graubünden, and the Tödi pack spanning Glarus and Uri. Each group occupies distinct territories across the country.

The death of M633 follows a series of livestock attacks attributed to the animal. Its lack of affiliation with any known pack highlights the occasional presence of solitary wolves in Switzerland. Authorities continue to monitor wolf activity, particularly in areas where conflicts with farming occur.