High-tech electronic tags on whale sharks, the world's largest fish, have revealed how and where they find food.Researchers in Belize have tracked the sharks as they dive almost a kilometre in search of food, and find shoals of spawning fish in order to eat the eggs. A young whale shark takes a closer look at two divers The sharks grow to 20m in length, and are listed as vulnerable to extinction. The researchers believe their findings will help to plan tourism operations around whale sharks in a way that does not harm the creatures themselves. These new, unprecedented insights into...