Gray Gorillas

An unnamed pack of Killer Gorillas acted as the main antagonists of the live action film, Congo - being of a completely unknown species not yet discovered by science they had an unnatural aggression towards humans which other great apes generally lack: to the point they would viciously murder humans who intruded upon their home. They all live in the fictional city ruins of Zinj near the fictional volcano called, Mt Mukenko. During the attack on the expedition of scientists who are trying to find out what happened to Charlie Travis and Jeffery Weems who got killed by a pack of killer gorillas, At the end of the movie, the volcano started to erupt by spewing hot lava that killed and burned all the killer gorillas.