Besides humans, gorillas the next enemy to a leopard and this has been killing them in the Virunga volcanoes and another case was also in Gabon where a sick young gorilla was killed by a leopard. In case the gorillas are threatened, they behave in a unique way in that the silverback makes a number of characteristic sound, gesture and an intensive smell. They are always in position to defend the group against the attackers of the group with help of young energetic males.