These adaptable primates store fat in their tails and hind ... Females are inactive during this time and may not leave their tree holes. During the same season, however, males are more active.

Hikers searched a forest near Puducherry at night and found some at-risk primates in a first-of-its-kind sighting, a study said. Photo from P. Aravind Aathi via Mani, Aathi, Sivakumar, Bystrom and ...

Darwin's great insight, and the unifying principle of biology today, is that all species are related to one another like sisters, cousins, and distant kin in a vast family tree of life.