NASA's Mars Reconnaissance Orbiter snapped a photo of a lava flood on Mars' Elysium Planitia region that looks like an elephant's head!
Elephant Face on Mars, the massive optical illusion photo which was taken by the orbiter's HiRISE (High Resolution Imaging Science Experiment) camera earlier this month is nothing but lava flow
University of Arizona planetary scientist Alfred McEwen has a nice explanation of what the Elephant of Mars actually is over at the HiRISE website:
This is a good example of the phenomena "pareidolia," where we see things (such as animals) that aren't really there. Actually, this image covers the margin of a lava flow in Elysium Planitia, the youngest flood-lava province on Mars.