How do dolphins use echolocation to communicate?

Dolphins use echolocation primarily to navigate and hunt, but it also plays a role in their social communication. They emit high-frequency clicks that travel through the water and bounce back after hitting an object. By analyzing the returning echoes, dolphins can determine the distance, size, and shape of the object. Dolphins also use signature whistles, which are unique to each individual, allowing them to identify each other and communicate over long distances in their social groups.