Depends on what type of bear. If it were a grizzly I'd definitely bet on the bear. Look at the size of this thing. Gorillas max out at about 400lbs, a grizzly can get up to 1500lbs. Plus the gorilla really has no weapon except for its muscles, a grizzly has the claws on its front paws that would shred the gorilla. Serioulsy, a gorilla would do nothing more than piss off the bear.