The White Tufted Marmoset is a New World primate who lives in the forests on the Atlantic coast of southeast Brazil. Of all the marmosets, they have the southernmost range. They have a grey-black skin, a touched tail and remarkable white ear-tufts which flop over more distinctly than the Common Marmoset's. They live in the coastal forests up to a sea-level of 500 m. They are diurnal and arboreal, living almost all of their life in the trees. They live together in small groups of two to eight animals. Their size ranges from only 14 to 18 centimeters and weigh around 400 grams. Their diet consists of tree sap, fruit, insects, eggs of birds, flowers and spiders. Common Marmosets have long limbs and tail which they use for climbing and have specially designed teeth for extracting gum from trees. Distinguishing characteristics of common marmosets include white ear tufts, and a white blaze on the forehead. Little is known about their reproductive patterns. Gestation is approximately 170 days and births are typically of twin offspring.