According to Reference.com, a group of monkeys is called a troop. Monkeys live in troops comprised of several hundred individuals. These troops constantly travel searching for food.
Monkeys are a varied group of mammals of the primate order. The monkey category includes all that are not ape, human or prosimian. Common features of monkeys include sitting in an upright position, human-like faces, stereoscopic color vision, flat nails and adept climbing ability.
Monkeys have one baby at a time and keep that baby for a long period. Members of the troop aid the mother and baby. Travelling in troops keeps the monkeys protected from predators.