Wolverines are generally nocturnal, but will forage by day if they need to. Their diet varies throughout the year. In summer, they feed on small animals, such as rodents and ground-living birds, and readily feast on summer fruits. In winter, when most other carnivores are hibernating, wolverines may tackle bigger prey, such as deer. Their wide feet act as snowshoes, allowing them to walk over deep snow, in which hapless deer are defenseless and unable to make their escape.
Wolverines mate in early summer and young are born in underground dens the following spring. They leave their mothers in the autumn.