The proof, via UFO Sightings Daily:
This crab-like object was found in a Mars rover. Its unknown exactly who found it, but it is really interesting. It does appear alive. It may be a crab-like animal, or it also may be a plant. This object has many arms and one of them goes to the left of the picture a very long ways. That arm is longer than all others. Plant or animal it really doesn’t matter. The significance of this is that it shows signs that it is alive. That is everything, but not to NASA. Even if every person on Earth told them to turn the rover to the left and take a closer look at this object, NASA will reject it and say, “thats not part of our mission.”
UFO Sightings Daily reports it also spotted in this photo “another animal close to this crab, as well as a broken stone building.”
Or maybe, just maybe, it’s a rock. And a case of pareidolia. Nah, scratch that. Definitely a space crab.