Monkey

Golden Lion Tamarin

Photograph by Mark W. Moffett

The critically endangered golden lion tamarin is named for its striking orange mane. Golden lions live primarily in the trees. They sleep in hollows at night and forage by day while traveling from branch to branch. Long fingers help them stay aloft and snare insects, fruit, lizards, and birds.

Japanese Macaque

Photograph by Tim Laman

Japanese macaques, also called snow monkeys, live farther north than any other non-human primates. Their thick coats help them survive the frigid temperatures of central Japan's highlands. But when the mercury really plummets, they go to plan B: hot-tubbing in the region's many thermal springs.

Mandrill

Photograph by Tim Laman

Bright red-and-blue facial markings identify this mandrill as a mature male. Mandrills are the world's largest monkeys.

Gelada Monkeys

Photograph by Michael Nichols

The last of the grass-grazing primates, Ethiopia's gelada monkeys live in matriarchal societies.

Howler Monkey

Photograph by Joel Sartore

The highly vocal howler monkey is the largest of the New World (Central and South America) monkeys.

Spider Monkey

Photograph by Joel Sartore

Spider monkeys, like this young one in Bolivia's Madidi National Park, are dependent on their mothers for about ten weeks after birth.

Rhesus Monkey

Photograph by W.E. Garrett

Though rhesus monkeys feed mainly on leaves and roots, they supplement their diet with insects and other small animals. The Asian monkeys collect food and hoard it in specialized cheek pouches, saving morsels for later.

Vervet Monkeys

Photograph by Chris Johns 

Also known as green monkeys, vervets inhabit much of sub-Saharan Africa.

Olive Baboons

Photograph by Michael Nichols

Olive baboons, like this mother and baby, are one of five baboon species. All live in Africa or Arabia.

Squirrel Monkey

Photograph by Steve Winter

Among the most common of South American monkeys, squirrel monkeys can move through the trees using great, bounding leaps.

Proboscis Monkey

Photograph by Tim Laman

Distinguished by its prominent nose, the endangered proboscis monkey lives only on the island of Borneo, where deforestation threatens its continued existence in the wild.

Source : http://animals.nationalgeographic.com/animals/photos/monkeys/#/proboscis-monkey_6456_600x450.jpg