The zoo announced Friday that on the morning of Dec. 7, zookeepers discovered Kivuli, the black-and-white colobus monkey, had given birth overnight.

On an island in Panama, a fad that one researcher called "viscerally disturbing" has recently taken off among a group of young male monkeys. These adolescents and juveniles have started to kidnap the ...

A baby howler monkey clung to the back of an older male monkey, its tiny fingers grasping fur. But they’re not related and not even the same species. Scientists spotted surprising evidence of what ...

Between the Old World, which includes Africa and Asia, and the New World, which includes Mexico and Central and South America, there are well over 200 monkey species. Yet, nearly all species of baby ...