Marmosets are New World Monkeys that lack prehensile tails. They move on all four limbs possessing longer forelimbs, squirrel-like hands and feet that lack opposable thumbs and big toes, but have sharp claws that dig into bark. Their fur is soft and silky; the face is bare. These tiny creatures are the smallest of primates weighing 3-12 ounces. Commonly they eat gums, tree sap, fruits, nectar, insects, and birds of Central and South American tropical forests.