The Pygmy Marmoset (Callithrix (Cebuella) pygmaea) is a monkey native to the rainforest canopies of western Brazil, southeastern Colombia, eastern Ecuaor, and eastern Peru. It is one of the smallest primates, and the smallest monkey, with its body length ranging from 14-16 cm (excluding the 15-20 cm tail). Males weigh around 140 g (5 ounces), and females only 120 g (4.2 ounces).