Duke Primate Centre has a map of their distribution. The Ruffed Lemurs are in their own genus Varecia separate from the other Eulemurs because of their unique reproductive behaviour. The tail is not prehensile, the lemur can't hang from its tail like a spider monkey does. The thick tail is as long as its body and is used to balance along a branch and jump from tree to tree. It is also used to communicate their feelings.
Ruffs spend the most time in trees and eat the most fruits of all large lemurs.
They also snack on leaves, shoots, seeds, nectar and may even eat soil. Females form the core of the group and defend the territory. They are usually larger than the males. Black and White Ruffs have been found in monogamous pairs, or in larger groups of 5-16. Females are particularly defensive of territory.