 The only other "Eulemur" species that occurs within the range of the black lemur is the common brown lemur, which overlaps with the black lemur at the extreme southern and eastern edge of its range, and the red-bellied lemur, on the Tsaratanana Massif.The common brown lemur and the red-bellied lemur have different coloration and do not show the extreme sexual dimorphism of the black lemur, making confusion between the black lemur and the other species unlikely.The black lemur primarily eats fruit, which makes up an estimated 78% of its diet.