**The smallest monkey is the Pygmy Marmoset, also known as the ‘finger monkey. ’** This small monkey is native to the rainforest canopies of South America and is no bigger than a human thumb.
It is one of the smallest primates in the world, reaching a maximum body size of only around 6 inches (15 cm). It has a light orange coloring along its back with a white and black neck, and its tail can grow up to about the length of its body. Despite its small size, the Pygmy Marmoset is still able to jump around 18 feet (
5 m) between tree branches with ease.