Examining langurs and odd-nosed monkeys provided scientists with evidence that social behaviours, such as extended care by mothers, evolved by adapting to live in extremely cold climatic conditions in the long-run.
Other social behaviours that they studied included increased infant survival and being able to live in large complex multilevel societies.
The study was led by researchers from Northwest University in China and a team including the University of Bristol (UK) and the University of Western Australia, Australia. It is published in the journal Science.
