The giant clam is the largest mollusk in the world, growing up to 4 feet long and weighing over 500 pounds. It gets only one chance to find a home. Once it places itself in a certain part of a reef, it stays stuck there for the rest of its life. Giant clams primarily live in warmer waters, like the Indian Ocean and South Pacific. Their massive size comes from sugars and proteins consumed from algae that they provide homes for. Although there have been several rumors, the giant clam is not a man-eater, and there is no record of a giant clam-related human death.
Bonus Fact: All giant clams have different coloration; no two are alike.