Website ufosightingsdaily.com posted images taken by the Curiosity rover droid which is exploring the Red Planet, taking pictures for NASA and beaming them back to Earth.
In an article entitled “Lizard Crawling On @NASA Mars Rover This Week, March 2017,” the website’s editor Scott C Waring, said: “This little lizard was holding on for dear life on the Mars Curiosity rover’s camera.
“The animal looks a lot like a lizard with a tall fin back… much like one type of dinosaurs here on Earth… just much smaller.”
He claimed in another image taken by the rover just 10 minutes later yesterday, showed the creature had jumped off.
He added: “The photo of before and after is about 10 minutes apart so it is enough time for the animal to have crawled to a new location on the other side of the camera arm.
“This is 100 per cent real proof that alien life, albeit small…does exist on Mars…and at the moment…exists on the Mars rover.”
But, sceptics are not convinced.
They argue it is just an optical illusion, and it is a rock below the rover.
They say it is the effects of pareidolia, which is a phenomenon when the brain tricks the eyes into seeing familiar objects or shapes in textures or patterns such as a rock surface or clouds.
Hoax-buster Scott Brando, who runs debunking website ufoofinterest.org, said: “All I see is a rock.”