Is this a Martian skull?

This photograph taken by the Mars Spirit Rover has got space-gazers talking.

The head-shaped object in a Martian desert appears to show eye sockets and a nose leading to speculation it might be an alien skull.

One UFO enthusiast speculated: “The skull is 15 cm with binocular eyes 5 cm apart. The cranial capacity is approximately 1400 cc.

“There appears to be a narrow pointed small mouth, so this creature most likely is a carnivore.”

Another joked: “Is he decapitated or is he buried up to his neck?”

I don’t believe this is an actual skull but it’s still fun to look at this image. It’s probably just more shadows playing tricks on the eye. But you’ve got to admit it, the shape is bloody interesting.