Whales, dolphins

Whales and dolphins use echolocation to find their way, hunt, and talk to each other underwater. They make clicking sounds that travel through the water and bounce off objects. The echoes tell them where things are, how far away, and how big they are. Dolphins use a special part of their head called the melon to focus these sounds. Their echolocation is so good they can tell the difference between a fish and a rock. Toothed whales, like sperm whales, use loud clicks to find food deep in the ocean. These sounds can travel very far, helping them find food or friends miles away. Dolphins often hunt in groups, using echolocation to work together. They can even find fish hiding in sand. Echolocation helps whales and dolphins survive in the deep, dark ocean.