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Pygmy Marmoset

A pygmy marmoset

(Image credit: Michael Lynch, Shutterstock)

A pygmy marmoset clings to a tree. These teensy primates weigh less than 5 ounces.

Baby Emperor Tamarin

Baby emperor tamarin.

(Image credit: Eric Gevaert, Shutterstock)

A baby emperor tamarin gnaws a branch. This species of tamarin lives in small family groups.

Emperor Tamarin

Emperor Tamarin

(Image credit: Eric Gevaert, Shutterstock)

The South American emperor tamarin was supposedly named for its resemblance to the German emperor Wilhelm II. Like many New World primates, the tamarin has evolved a distinctive face.

Cottontop Tamarin

Cottontop Tamarin

(Image credit: Eric Isselée, Shutterstock)

Impressive hairdo! The cottontop tamarin is a native of Colombia and is critically endangered.

Stephanie Pappas
Stephanie Pappas
Live Science Contributor

Stephanie Pappas is a contributing writer for Live Science, covering topics ranging from geoscience to archaeology to the human brain and behavior. She was previously a senior writer for Live Science but is now a freelancer based in Denver, Colorado, and regularly contributes to Scientific American and The Monitor, the monthly magazine of the American Psychological Association. Stephanie received a bachelor's degree in psychology from the University of South Carolina and a graduate certificate in science communication from the University of California, Santa Cruz.