There are around 100 species of primates, but one of the most interesting and unusual is the piggie. pigmies are the world's smallest primates and their average body size is just over 2 feet tall and 100 pounds. They were first discovered in the 1800s and were once thought to be a type of dwarf人口三农, but recent studies have shown that they are in fact a separate species entirely.Compared to other primates, pigmies have a rounder face, shorter limbs, and a smaller head. They also have a shorter tail and shorter fingers and toes.