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13 of the ugliest animals on the planet

By: Bryan Nelson on Sept. 3, 2010, 12:10 p.m.

Photo: Chris Corwin/Flickr

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This gremlin-looking creature, called an Aye-aye, is actually a primate found in Madagascar.

Aye-ayes have a number of unusual traits, including a long, bony, witch-like middle finger that they use to pry insects and grubs from tree trunks. This allows them to fill a biological niche much like a woodpecker might. They are nocturnal, only coming out at night.