Gray-handed night monkey

The gray-handed night monkey, Aotus griseimembra, is a night monkey of northern Colombia and western Venezuela that was formerly counted as a subspecies of the gray-bellied night monkey and is now generally treated as a species of its own. In Colombia it ranges from the Sinu River region east to the Venezuelan border, including the Sierra Nevada de Santa Marta and the Magdalena and Cauca valleys, and in Venezuela it occurs west and south of Lake Maracaibo. It is a fairly small monkey, with males weighing roughly a kilogram, a short dense coat that is grayish to reddish brown above and yellowish below, and hands and feet coloured like light coffee. It is arboreal and nocturnal, living in small territorial groups in primary and secondary forest and even coffee plantations. It is listed as Vulnerable because of forest loss and because many were captured in the 1960s and 1970s for malaria research.