Fun facts about the Shark
Sharks have electroreceptors called the ampullae of Lorenzini that detect the tiny electric fields generated by muscle contractions — they can sense a heartbeat from metres away. They shed and replace thousands of teeth over a lifetime, with new rows continuously moving forward like a conveyor belt. Whale sharks, the largest fish alive, are filter feeders that eat only plankton. Unlike bony fish, sharks have no swim bladder and must keep swimming or sink.