On a shark’s snout, you’ll see dozens of small dark dots that look like freckles. Each one is the opening of a gel-filled tube called an ampulla of Lorenzini, named after the 17th-century scientist who first described them. They are some of the most sensitive electrical detectors in the entire animal kingdom.
Every living animal generates a faint electrical field. Heartbeats, twitching muscles, gill movements - they all leak tiny amounts of electricity into the surrounding water. A shark’s ampullae pick those signals up.
That’s why a shark can locate a flounder hiding under sand with no visible fin or movement. In some species (especially hammerheads), the sensitivity is so fine they can pick up electricity equivalent to a flashlight battery wired across the entire Atlantic Ocean. It’s basically a sixth sense - and it’s been keeping sharks fed for 400 million years.
