The bizarre aye-aye (Daubentonia madagascariensis) is one of the most unusual primates on the planet, so unusual that it was originally classified as a rodent. The thick coat of the aye-aye is slate grey to brown with white flecks of long guard hairs, which are lighter at the tip. Their faces are paler than the rest of the body, with large, leathery ears and striking, yellowish-orange eyes. The hands of the aye-aye are also very distinctive, having elongated, thin fingers which bear curved, claw-like nails. In particular, the third digit is so thin that it appears to be little more than skin and bone. This finger is often used to reach in to small holes in trees or termite mounds to retrieve food such as insects. The aye-aye is the largest nocturnal primate and has a long, bushy tail.
Most Aye-ayes in the Madagascar franchise have thinner fur, and a smaller, almost hairless tail. The males are often darker and greyer than the brown females. Maurice is the only exception.