The pygmy tarsier (Tarsius pumilus), it is the smallest primate in the world. The pygmy tarsier has a head-body length of 95 to 105 mm (about 4 inches), and weighs less than 57 grams (2 ounces). And it is also known as the mountain tarsier or the lesser spectral tarsier, is a nocturnal primate found in central Sulawesi, Indonesia.