The spider monkey’s tail is prehensile, which means “capable of grasping.” It is generally longer than the animal’s body and acts as a fifth limb—an adaptation to life in the tree canopy.

Scientists think these outsize organs create an echo chamber that amplifies the monkey’s call, impressing females and intimidating rival males. Proboscis monkeys are endemic to the jungles of ...

Robin Williams' daughter, Zelda, took to X, formerly Twitter, this weekend to debunk a viral photo of the late comedian alleging he owned a pet monkey. "Dad didn't own a pet monkey," Zelda wrote.