Macaques (scientific name: Macaca Mulatta)51-63 cm long. Rhesus is a typical animal of the genus Rhesus, characterized by short tail and cheek pouches. The body is stout, with an average length of about 50 cm. The forelegs are about the same length as the hind legs, the thumb is opposable to the other four fingers, the grip is flexible, the forehead is low, and there is a ridge-protuberance. The head is Brown, the back is brown-gray or brown-yellow, the lower orange or orange-red, Pale gray-yellow ventral surface.