Oliver was a performing Common Chimpanzee who was once promoted as a missing link, or a "Humanzee" (a human-chimp hybrid).
"'Oliver' is a habitually bipedal ape that has captured the imagination of both laypeople and scientists. He has been touted as a relict australopithecine, a bigfoot, or even the result of a clandestine human-chimp hybridization experiment. After years of lively debate, Oliver's DNA was sampled to settle the issue and perhaps provide us with a breathing version of the missing link. The results are in ... and, alas, Oliver is just a standard-issue chimpanzee with a penchant for walking."cite this quote]