 The species-rich mouse lemur genus "Microcebus" is distributed over nearly all remaining forest areas of Madagascar with a high variability in species distribution patterns and are very similar morphologically.They are so similar, that the gray mouse lemur was considered the only mouse lemur until recent studies proved it to be otherwise.Along with other morphological similarities, the Madame Berthe's mouse lemur and the gray mouse lemur share a similar diet (both containing the same food groups but in different proportions) and live in the same region of western Madagascar.