The douroucouli, also known as the night monkey, is the only nocturnal monkey. It lives in the dense rain forests of Central and South America from Nicaragua in the north to northeastern Argentina in the south. They have large eyes set in a flat face. The head and the body measure to only 24 to 37 cm, with a tail of equal length and the fur is soft, short and woolly. They are silvery or dark grey above with grey or brown under-parts.
Douroucoulis are omnivorous, eating fruits, insects, small birds and small mammals.