These shy, rather small monkeys have a brownish fur with an orange belly, the large round eyes are surrounded by a white mask,that is turning black on the outside. During the day they are sleeping well hidden in the thicket and are searching the tree-tops for food /fruit, nectar, insects) after dawn. During the night they are better hidden from their enemies. Mostly they are behaving quite during the night as well, sometimes you can hear their deep owl-like cries.