Well, at least that’s what UFO spotters looking at this NASA Mars Rover picture saw:
I, personally, am more inclined towards a bowling ball, which would definitely indicate the presence of intelligent life on Mars, unlike here, on Earth.

The "famous" Face on Mars - part of the Cydonia region, taken by the Viking 1 orbiter and released by NASA/JPL on July 25, 1976. - Source: NASA/JPL

A photo of what appears to be a "female" figure taken on the red planet by the Spirit rover. - Source: NASA

