In their natural habitat, the only thing that could kill a silverback is a man with a gun. An eastern silverback's weight ranges from 180–260 kilograms, he's far beyond the size of contemporary carnivores. A leopard can present a threat to a young gorilla. read more
However, there are some animals that would kill a gorilla in a fight. If you put a gorilla up against a rhinoceros in a pit, the gorilla would be killed fairly quickly. read more