Most of the speculation about the koolakamba comes from the late 19th and early 20th century, about the time that Paul Du Chaillu was “discovering” the gorilla. read more
For awhile Karl Amman was investigating the “Bili ape,” which at first some speculated might be a gorilla-chimp hybrid. There’s no evidence for it though, and the Bili apes seem to have just been large and aggressive chimps. read more