Cottontop tamarins are among the smallest of the primates with a body length of 17 cm and tail length of 25 cm. The forelimbs of the cottontop tamarin are shorter than the hind limbs, and unlike other monkeys the thumb of the cottontop tamarin is not opposable and it does not have a prehensile tail.
Today, the cottontop tamarin is considered to be a critically endangered species with an estimated wild cottontop tamarin population of just 6,000. The main reason for the severe decline in the cottontop tamarin population is that they have lost more than 75% of their natural habitat to deforestation.
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