"The Horseshoe Crab", quite a unique Sea Creature. Horseshoe Crab.org states this wonderful ancient specie has been on our planet for 540 million years. I understand that the Horseshoe Crabs are referred to as living fossils. They have 10 eyes, Blue Blood which protects them & quite controversial with the Pharmaceutical Corporations. Delaware Bay, USA is the world's largest spawning ground for Horseshoes.