Rondon's marmoset

Rondon's marmoset (Mico rondoni), also known as the Rondônia marmoset, is a small monkey of the family Callitrichidae found in the south-western Brazilian Amazon, in a range bordered by the Rio Mamoré, the Rio Madeira, the Rio Ji-Paraná and the Serra dos Pacaás Novos. It was described only in 2010 and named for the explorer Cândido Rondon; before that it was included in Emilia's marmoset. It belongs to the silvery marmoset group of Mico, with generally silvery-gray fur, dark fur on much of the head, a whitish patch in the middle of the forehead and a mostly black tail. It averages about 330 grams. Exudates are an important part of its diet, and chisel-like lower incisors and an enlarged cecum are adaptations for them. It may be the most threatened species in Mico, and the IUCN considers it vulnerable, though data deficient has been suggested; Weddell's saddleback tamarin takes over its gum feeding sites.