The world’s smallest monkey is called the pygmy marmoset ... Although pygmy marmosets are on Ecuador’s red list of endangered species, there is some disagreement among primate specialists ...

the smallest living Old World monkey species that weighs in at only 2 to 3 pounds, about the size of a cottontail rabbit. Talapoins are part of a large group of monkeys called guenons, which are ...

The International Union for Conservation of Nature has updated its Red List of Threatened Species Maria Pasquini is the staff editor for human interest’s digital vertical at PEOPLE. She has been ...