The wolverine,a medium sized mammal weighing no more than 50 lbs., has earned its reputation for ferocity with its documented ability to kill prey many times its size . the reason why wolverines have so many conflicts with other animals (including wolves,cougars ,and even bears) is probably because of the wolverine's preferred hunting style. Rather than chasing down or tricking its prey like most hunters ,the wolverine prefers to take its meals directly from other hunters . So while a polar bear or a lone wolf might be enjoying a hard earned carcass ,a hungry wolverine may try to take his lunch. this keeps the wolverine in plenty of fights.