The red belly of these New World monkeys is its most remarkable outward characteristic.

Otherwise it is black with a thin white mustache on its face and a black-brown back.

They live in social groups of related animals.

The father carries the babies most, but siblings (brothers and sisters) will also share the carrying of youngsters, and so learn how to be good carers.

There are three subspecies:[1] This New World monkey-related article is a stub.