Dunn’s team analyzed the biological “budget” of these primates and found a direct negative correlation: males with large ...

Deep in the rainforest, the monkeys are yodeling. Their wild calls echo across the foliage, sending signals of sex and survival. For decades, scientists have studied why they make these sounds, but ...

A new study has found that the world's finest yodellers aren't from Austria or Switzerland, but the rainforests of Latin America. The research provides significant new insights into the diverse vocal ...

With their bright red, hairless chests and grass-grazing lifestyle, gelada monkeys are quite unusual. They are the only primate, other than humans, to primarily live on land instead of in trees, and a ...