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 ...

If it weren’t for a cheeky monkey named Naruto, who, as the story goes, stole a photographer’s camera in an Indonesian park and snapped a selfie, crested black macaques might still be ...

Exports of long-tailed macaques from Cambodia will remain legal pending further review, despite recommendations for a suspension to prevent poaching of the critically endangered monkey from the wild.