The giant aye-aye is an extinct relative of the aye-aye, the only other species in the genus Daubentonia. It lived in Madagascar and appeared to have disappeared less than 1,000 years ago. It is only known from subfossil remains.
As of 2004, giant aye-aye remains consisted of four incisors, a tibia, and postcranial material. Subfossils of this species have been found in the southern and southeastern portion of Madagascar, outside of the range of extant aye-aye. Giant aye-ayes are believed to be very similar morphologically to the aye-aye, but 2 to 2.5 times larger, based upon jaw and incisor measurements.