(wildlife chirping) – [Narrator] It’s a pygmy marmoset. Weighing less than an apple, pygmy marmosets are the smallest monkey in the world. – Look at their little faces.

What is the world's smallest monkey?

(wildlife chirping) – [Narrator] It’s a pygmy marmoset. Weighing less than an apple, pygmy marmosets are the smallest monkey in the world. – Look at their little faces.

What's the smallest monkey you can own?

Tamarin. Tamarins are some of the smallest monkeys that you might keep as pets. They weigh less than a pound and live for about 15 years. You’ll only need about 7 square feet of living space for a tamarin, though they still require ample investments of time and energy.