Aye-aye

Aye-ayes are the largest nocturnal primate in the world. They are also the only primate thought to use echolocation, which they use to find insect grubs hidden 2cm deep inside a tree. During mating, aye-ayes hang upside-down on a branch, and the procedure lasts for about an hour.

Source: http://www.bbc.co.uk/nature/life/Aye-aye

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