What is a aye aye?

The Aye-aye, its scientific name being Daubentonia madagascariensis, is a type of lemur native to Madagascar, and is the world's largest nocturnal primate. The Aye-aye combines rodent-like teeth with a long, thin middle finger which has the same basic function as a woodpecker's beak, as this type of lemur finds food by tapping on trees to find grubs burrowed underneath the wood, then chews holes into the tree and inserts its elongated middle finger to remove the grubs.