Heavy metals are a poison found in Creatures 2, Creatures 3 and Docking Station. They arise from radiation. Heavy metals slowly destroy a creature's immune system, and, if not cured, will make the creature infertile. It can also cause mutations in unborn creatures. It is number 140 in the C2 Chemical List and number 66 in the C3 and DS Chemical List. In both cases, heavy metal poisoning is cured by injecting EDTA.