Humans may not be the only ones to use language. Dolphins also use words and sentences. Dolphins send messages to each other. They use sounds to identify themselves, have relations, and do things together. We might understand dolphin language and talk to dolphins in the future.

Researchers recorded two bottlenose dolphins. The dolphins listened to each other and then answered. It was like a conversation between two people. It was like human spoken language. This shows that dolphins are very clever. Dolphins' language is developed, like human language.