The world’s smallest monkey is called the pygmy marmoset, and it is, predictably, very tiny, just a little scoop of fur. It likes to eat the sticky resin found in tree bark, known as gum ...

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 ...

In short, the total costs for a monkey can easily reach over $20,000, and that number will climb a great deal if you opt for ...

This story appears in the August 2011 issue of National Geographic magazine. In India monkey business takes on a whole new meaning. Hanuman langurs are trained in New Delhi to scare off aggressive ...