They're clearly rocks, but they certainly bear a streaking resemblance to human fingers.  That has lead some in the UFO community to claim that human fingers have been found on Mars.

This photo of the 'fingers' on the surface of Mars was uploaded by the Jet Propulsion Laboratory (JPL):

JPL Fingers on Mars
JPL/NASA
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Fingers on Mars Close-Up

close up of the Fingers of Mars
JPL/NASA
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