Jack Rink, a geochronologist from Canada's McMaster University, has determined that a gigantic ape which became extinct 100,000 years ago co-existed alongside humans. Gigantopithecus blackii, the largest primate that ever lived, roamed southeast Asia for nearly a million years before the species died out 100,000 years ago. This was during the Pleistocene period, by which time humans had already existed for a million years.