Brown bears have no natural enemies except man. Cubs are sometimes killed by pumas and male bears, but healthy adults fear only man and each other.
humans
Wolfs are one.
The grey wolf (in packs) the mountain lion,other grizzly bears,and man.
Enemies of the grizzly bear are primarily other grizzly bears, wolverines and human hunters and poachers.
Brown bear have few enemies. Their competitors are usually wolves and possibly grizzly bears. Human beings are perhaps their greatest enemy.
The grizzly bear,cougar,man,wolves and coyotes.
It lives in the caves like some other bears.
The polar bear, grizzly bear, and black bear. Though some may think that a brown bear and a polar bear can have babies together that has only happen between a Grizzly bear and a polar bear. Note: Grizzly's and Brown bears are different species of bear.
Grizzly bear
A Grizzly Bear is big but, if you measure them side by side, the Polar Bear is seven inches taller than the Grizzly Bear.
Grizzly bear is not poisonous.
In most of its range the cougar is the apex predator but occasionally will have a run in with a black bear, grizzly bear, wolf pack or jaguar.