Now that there’s conclusive evidence that at least part of Mars was once a water-soaked place where living things could have wriggled, swam or slithered, it takes only a few more leaps of speculation to wonder how they might have died.
Did their eyes bug out like Arnold Schwarzenegger’s in “Total Recall”? Not likely – hypothetical Martian creatures probably wouldn’t have had enough time to evolve eyes before the planet became the cold and arid place it is today.