Aye-ayes build ball-like nests in treetops from leaves and branches, in which they curl up and sleep during the day
Aye-ayes have opposable (grasping) big toes on their feet that they use to grab onto and hang down from tree branches.
Aye-ayes locate insects by tapping on a tree branch with their long middle fingers. They then use these fingers to dig out insects. This is called percussive foraging. They also use this finger to dig the pulp out of fruit.
An extinct form of the aye-aye (Daubentonia robusta) once lived in southwest Madagascar. It likely weighed over 11 kg, which is three to five times what the existing aye-aye species weighs. It probably co-existed with early humans.
Aye-ayes are one of the most distinctive mammals on earth due to their unusual appearance. In Madagascar they are considered to fill the ecological niche of woodpeckers which are absent from Madagascar.