Non-human primate, that is, Ape actor Peter Elliott shares his knowledge of chimpanzee and gorilla vocabulary and facial expressions.

via IMDb:

Peter Elliott is the film industry's primary primate. He both as a performer, in films like Missing Link and The Island of Doctor Moreau, and as a choreographer of other performers, as in Gorillas in the Mist and Congo. He also teaches animal study at London's Central School of Speech and Drama.

https://www.theguardian.com/science/video/2010/oct/13/chimpanzee-gorilla-vocalisation-body-language