Definition
'Callithricidae' is a family of New World monkeys, commonly known as marmosets and tamarins. They are small primates characterized by their claw-like nails (instead of flat nails on all digits except the big toe). They often have striking coloration and tufts of hair around their faces. They are arboreal and live in family groups. They are found in the rainforests of South America. 'Callithricidae' represents a specific group of small, specialized primates.