Thirteen million years ago, a group of medium-sized monkeys known for guarding their territory among the treetops with fearsome "howls" started doing something new. These monkeys, among the oldest ...
Fossils show that howler monkey ancestors were eating leaves 13 million years ago, shaping body size and evolution.
An extinct relative of the howler monkey may have been the first leaf-eating primate in South and Central America ...
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