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A UFO hunter claims this is a fossilized iguana on the surface of Mars.

The enthusiast stumbled across the petrified lizard while inspecting photographs taken by Nasa's Mars rover Curiosity.

He uploaded the images to YouTube under the sobriquet UFO HuntingClouds - and to date they have been viewed more than 8,000 times.

UFO fans have been keen to have their say, with many convinced the strangely-shaped object is indeed the remains of a lizard.

Scott Waring said: "Dude, add contrast and you will see the eye, mouth and nostril detail come out!

"Wow, amazing catch.

Another, going by the name of ingersollturok said: "Awesome work!"

However, others were less convinced.

DeathDOer01 observed: "Clearly a rock...plus no footprints...good catch tho."

And Steve Phillips noted: "Obviously an iguana... or maybe..just maybe a rock."