Widely distributed in the forests of Central and South America, from Panama south to Paraguay and Northern Argetina
Unusual among the New World monkeys, they are monochromats, that is, they have no colour vision, presumably because it is of no advantage given their nocturnal habits
They have a better spatial resolution at low light levels than other primates which contributes to their ability to capture insects and move at night.
All night monkeys form pair bonds, and live in family groups of the mated pair with their immature offspring
Only one infant is born each year. The male is the primary caregiver, and the mother only carries the infant for the first week or so of its life
Night monkeys constitute one of the few monkey species that are affected by malaria (often deadly to humans) making them useful as non-human primate experimental models in malaria research
Minor differences in the timing of cell proliferation can explain the large differences found in the eyes of two species — owl monkeys and capuchin monkeys — that evolved from a common ancestor. The findings also offer a lesson in how seemingly simple genetic changes in the brain and nervous system could produce the multiple evolutionary changes seen in more advanced brains, without compromising function.
Source Facts: http://en.wikipedia.org/wiki/Night_monkey