However, so little is known about them that the subspecies was considered, until very recently, extinct or even mythical.
Blue eyes are rare in nonhuman primates.
Current estimates indicate that there may be only a thousand or fewer of these unusual lemurs left in remote areas of northwestern Madagascar. Lemurs are among the most primitive of all primates. Blue-eyed lemurs grow to about 16 inches tall, with tails about 22 inches long.