In the misty jungles of the Western Ghats, high up in the canopy, a seldom-seen primate bounds through. A silver mane and curious face mark the lion-tailed macaque, one of India's most endangered ...

Director James Cameron's "Avatar" movies are populated by a species of outsized blue beings resembling humans, except with tails. So why does our species lack a tail, considering that our evolutionary ...

Heavy maternal investment makes sense: Females bear only four or five offspring in a lifetime. The tail of this Old World monkey isn’t prehensile but instead is used for balance, as with this ...