Wolves main prey are caribou moose, and sometimes musk oxen. They hunt in packs and target young, weak or injured animals. When the wolves spot a likely victim, such as a caribou calf with its mother, they spread out to sorround their prey. The panicked calf tries to flee and is separated from its kother. Then the wolves run thei victim down and kill it by biting its neck.
Wolverine
The wolverine sometimesbsteals prey killed by other arctic hunters. It is so fierce that the other predator just give its kill.
img source: http://mentalfloss.com/article/77630/11-ferocious-facts-about-wolverines