The pygmy marmoset is one of the world's smallest primates, and is the smallest true monkey, with a head-body length ranging from 117 to 152 millimetres to in) and a tail of 172 to 229 millimetres to in).
The finger monkey is the tiniest living primate in the world. It’s so small that it can hold on to your finger. Finger monkeys are, as a matter of fact, pygmy marmosets. They are also known by the names ‘pocket monkey’ and ‘tiny lion’. I WANT ONE!