 In the Manongarivo Special reserve, where the range of the two species overlap, there is a report of hybridization between the two species, but the resulting offspring always have orange eyes.Until 2008, the blue-eyed black lemur was considered a subspecies, "E. macaco flavifrons", of the black lemur.This true lemur has not been studied intensively in the wild, but it is known to be fairly social.