Black-headed night monkey

The black-headed night monkey, Aotus nigriceps, is a night monkey of Brazil, Bolivia and Peru, found south of the Amazon in primary tropical forest, swamp forest and seasonally flooded forest. It is about the size of a small squirrel, with adults weighing roughly 750 to 1,000 grams, small ears hidden by its fur, very large brown eyes, white patches by the eyes, cheeks and mouth, and three black stripes that meet on the forehead. It lives in small family groups, and males care for infants while pairs defend their territory against other pairs of the same sex. It eats mostly fruit, preferring ripe figs, along with flowers, leaves, moths, beetles and spiders. It is known to host the malaria parasite Plasmodium brasilianum and was heavily captured for research in the 1970s, but it is now listed as Least Concern.