The Invisible Underwater Messaging System in Blue Crab Urine

In estuaries off the coast of Georgia, the water is so murky that if you were to dive in, you couldn’t see your hand in front of your face. There, blue crabs feast on mud crabs, oysters, fish and more. You may eagerly approach these hand-sized arthropods when they’re cracked into pieces and doused in butter. But in muddy water, tiny mud crabs, no bigger than the tip of your thumb, steer clear of the hungry blue crab predators. In this crab-eat-crab world, they can’t see their enemies coming — but they can smell them. click here to read the story 20:01

Leave a Reply