The baboon appearing in the movie is not a chacma but hamadryas - a different species. The chacma baboon (Papio ursinus) is the largest species of baboon, whilst the hamadryas (Papio hamadryas) is significantly smaller and easily recognizable by a mane around his face - the only baboon species to have such feature.
A lab sheet's name box for the titular baboon reads "Shockma" instead of "Shakma".