What eats a black bear?

Black Bears have no predators...except humans.

Brown Bears have been known to kill Black Bears, especially small ones. A large pack of wolves can and have killed Black Bears before. People don't realize but the majority of mature Black Bear sows weigh between 150 to 250 lbs. Young Black Bears that recently got cut loose from their mother are even smaller than that and are the ones that seem to get themselves in trouble. The Black Bear has been around for thousands of years because it can climb trees just as good as a cat. It's their best defense against danger.