If you find gigantic footprints

A savage black bear has ripped the head off of the major's little girl. You are send to take the beast down. It has also ripped the arm off a fisher man and dragged it away never to been found. While on the third day in the wilderness you find the corpse of the bear. Something broke its neck and ate its lower half, leaving jagged broken bits of bone sticking out. But this is a really big bear! What the fuck could do that?