Geoffroy's saddle-back tamarin

Geoffroy's saddle-back tamarin (Leontocebus nigrifrons) is a small South American monkey that lives in Loreto, Peru. It was formerly treated as a subspecies of the brown-mantled tamarin and is now regarded as a species of its own. The head and body measure about 19 to 22 centimetres and the tail is longer, 30 to 33 centimetres. Males weigh around 354 grams and females around 369 grams. It lives in groups with several males and females, reaches sexual maturity at about eighteen months, and both sexes leave the group in which they were born. The species often forms mixed groups with the moustached tamarin, with which it sleeps in the same trees and shares alarm calls. Its diet is fruit, gums, nectar, insects and other small animals, and its known predators include emerald tree boas, Amazon tree boas, mussuranas and bushmasters. The IUCN rates it Least Concern.