Blue-eyed lemurs are one of two (non-human) primates to have truly blue eyes.
The Blue-eyed black lemur, identified as a species only in 2008. They were first considered a subspecies of the Black lemur but a few years ago they were finally reclassified as being a distinct species.
The Blue-eyed black lemur lives in Madagascar's northwestern tip. It occurs in primary and secondary sub-tropical dry and moist forests. Little is known about the behaviour of Blue-eyed black lemurs outside of captivity because there has not been extensive study of them in the wild.
Blue eyes are very rare in the world of primates. Apart from blue-eyed black lemurs, only some spider monkey species have blue eyes and their eyes can range in colour from a shocking electric blue, a light sky-blue, or a softer grey-blue.