 Both sexes have blue eyes, hence the common name, and are one of the only primates other than humans to consistently have blue eyes.The eyes can range in color from a shocking electric blue, a light sky-blue, or a softer gray-blue.Although the blue-eyed black lemur and the black lemur look similar, they can be differentiated by the blue eyes and lack of prominent ear tufts of this species, while the black lemur has orange-red eyes and long, spiky cheek hairs.