On Mars, whisper thin winds hiss along a dry, dusty canyon. Deadly ultraviolet radiation pours from an unshielded Sun. Nighttime cold reaches -80° C. Perfect weather for a fellow like the Martian waterseeker. Its parasol tail can lift three meters in Mars' low gravity, shading it from ultraviolet sunburn. The long snout can probe for pockets of ice under dried-up channels. And the giant ears, needed to hear well in the thin air, also serve as blankets: In Mars' frigid nights the waterseeker stays snug by clamping its ears tightly around its whole body.