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, about 50 cm long on average, with forelegs about the same length as the hind legs, opposable thumbs, a flexible grip, a low forehead and a raised ridge. The head is Brown, the back is brown-gray or brown-yellow, the lower orange or orange-red, Pale gray-yellow ventral surface.