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Smithsonian National Zoological Park l Friends of the National Zoo

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Great Ape & Primate thumbnails
pygmy marmoset
Jessie Cohen, NZP photographer

Pygmy marmosets are the smallest monkeys in the world. You can see just how small they are if you visit the Zoo's Small Mammal House.

They communicate using scent markings and high, bird-like calls as well as facial expressions and postures.

In addition to the high-pitched whistles and twitters, pygmy marmosets can produce an ultrasonic cry that is inaudible to humans.

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