These finger monkeys are native to the rain forests of Brazil, Peru, Bolivia, Ecuador and Colombia. Finger monkeys are, in fact, pygmy marmosets. They are also known by the names &quot;pocket monkey&quot; &amp; &quot;tiny lion.&quot; This cute little primate hugs and holds onto your finger so tight that it pulls on your heartstrings and makes you wish you could take it home with you. It is the tiniest living primate in the world. They belong to the family Callitrichidae, species Cebuella and genus C. Pygmaea.