File this under: bizarre Mars sightings. Believe it or not, the image you see above was spotted by Curiosity on the surface of Mars, and not doctored in any way. It appears to be a rodent of some kind, more specifically a guinea pig. Continue reading for a video and a link to the full-resolution image on NASA’s servers.

Sure, this is most likely just a regular rock formation, but it’s definitely one of the strangest looking ones we’ve ever seen. According to NASA’s official statement released earlier this week, Curiosity has detected “water and sulfur and chlorine-containing substances, among other ingredients.” For those who’d like to view the full-resolution image from NASA, please click here.