Was a squirrel discovered on Mars? Summary: Close examination of a photo taken by NASA's Mars rover Curiosity appears to expose a small squirrel or rat on the Martian surface. By Andy Smith | May 31, 2013 -- 15:48 GMT (08:48 PDT) Previous | Next Image 4 of 7 Zoom in a bit and you can get the first glimpse of the rat/squirrel on the left. Credit: NASA Topic: Nasa / Space Kick off your day with ZDNet's daily email newsletter. It's the freshest tech news and opinion, served hot. Get it.