An extinct relative of the howler monkey may have been the first leaf-eating primate in South and Central America ...

Fossils show that howler monkey ancestors were eating leaves 13 million years ago, shaping body size and evolution.

A morbidly obese wild monkey who gorged himself on junk food and soda left behind by tourists has been rescued and placed on a strict diet of lean protein, fruits and vegetables. Wildlife officials ...

WASHINGTON—Eat less, live longer? It seems to work for monkeys: A 20-year study found cutting calories by almost a third slowed their aging and fended off death. This is not about a quick diet to shed ...