Subfossils of a giant form of aye-aye are found at scattered sites in
the south and southwest of the island of Madagascar, outside the known
distribution of the living, or common, aye-aye. The subfossil aye-aye
, named Daubentonia robusta, has massive, robust limb bones implying a
species with a body weight 2.5-5 times as great as that of the living
species. A mystery exists regarding how a species this large with the
same specializations of teeth and manus as the living species could h
ave existed in a xeric environment.