Beavers play an important roll as an alternative food source in the summer months, in some areas 60% of the wolf's diet is beaver.
One of the most odd part of the diet of wolves is fish! Biologist Bod Bromley once observed a wolf in Canada's Northwest Territories catch five fish in fifteen minutes in the Talston River.
Wolves will also scavenge, In one study of moose carcasses in Algonquin Park, of 30 moose only 4 were killed by wolves, the rest died of natural causes.
Wolves will also eat wild berries and other fruit as a minor part of their diet.