The Pygmy Marmoset (Cebuella pygmaea) is the smallest true monkey in the world with a body length averaging just 15cm. Native to the rainforests of Brazil, Colombia, Ecuador, Bolivia and Peru, their small weight allows them to reach the very highest leaves of a tree which are inaccessible to most rivals. Because of their small size and fast movements they are considered hard to observe in the wild unless you know what to look for. These monkeys tap trees for sap by using their sharp teeth to gouge holes in the bark, so the secret is to find a tree with tell tale signs of bite marks ... and wait. With time they are actually quite an inquisitive monkey and will come surprisingly close to check out a human visitor. Living up to 12 years in the wild, a group typically consists of an adult pair and their offspring which can number up to six and I met this particular family in the Peruvian Amazon.