A monkey is a primate, either an Old World monkey or a New World monkey. There are about 260 known living species of monkey. Many are arboreal, although there are species that live primarily on the ground, such as baboons.
Common marmosets are very small monkeys. Males and females are of similar size with males being slightly larger. Males have an average height of 188 mm (7.40 in) and females have an average height of 185 mm (7.28 in). Males weigh 256 g (9.03 oz) on average and females weigh 236 g (8.32 oz) on average. The pelage of the marmoset is colored a blotchy brown, grey, and yellow. It also has white ear tufts and its tail is long and banded. Their faces have pale skin and have a white blaze on the forehead. At birth, infants have brown and yellow coats and develop the ear tufts as they age.
Might be you