The scaly foot gastropod is probably the worst snail name ever invented. Especially for one of the most incredible organisms on the planet. How many creatures can you name that have an iron shell? None. No creature can grow a metal sheath around itself—except Scaly G. Living nearly 2,400 meters (8,000 ft) below the ocean’s surface, near hydrothermal vents, the scaly foot gastropod incorporates the heavy metals floating in its habitat into its shell.