Horseshoe crabs, Limulus polyphemus, are often referred to as dinosaurs of the sea. Fossils show that the have lived on earth, unchanged, for about 480 million years! A horseshoe crab’s entire body is protected by a hard carapace, which molts when it grows. Ocean Runner Nichole is inspired to learn more about this ancient animal when she finds a molt on the beach. Seacoast Science Center Naturalist Ben Flynn fills her in on the facts.