Santarem marmoset

The Santarem marmoset (Mico humeralifer), also called the black and white tassel-ear marmoset, is a marmoset endemic to the Brazilian states of Amazonas and Para. It is found in a restricted area between the Tapajos river in the east, the lower Madeira and Roosevelt rivers in the west and the Amazon River in the north, and it lives in lowland rainforest and is common in secondary forest. The head and body measure 20 to 27 centimetres and adults weigh roughly 280 to 475 grams. The scientific name humeralifer refers to the mantle of light grey fur over the shoulders, and the black body is flecked with grey, with a ringed tail and buff to grey ear tassels. It travels in the lower forest canopy, feeds mainly on fruit and insects with some small lizards, frogs and tree gum, and lives in family groups of about six that normally have non-identical twins twice a year.