Wolves transporting the remains of beavers they have killed. Beavers are critical prey for wolves in the Greater Voyageurs Ecosystem for a 7-8 month period of time, roughly April to October/November…i.e., when ice on lakes and ponds is largely absent. Beavers constitute, on average, ~30-40% of all biomass wolves obtain from predation during this period. However, we have studied numerous wolves for which beavers are the primary prey during the spring to fall. For instance, beavers can constitute