Put a grown male in captivity, take away his troop stimulation, and anything goes. If you don't watch his body language and pay attention to it, you are GOING TO LOSE. He outmatches you in size, speed, and strength, and he's smart. read more
The male defends the troop, roaring and beating his chest with his fists to scare off intruders. If this does not work, he may charge and knock over or bite the attacker. Eastern gorillas can weigh 485lb (220kg), more than three times the weight of an average adult man. read more