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Dolphins are very beautiful and clever animals. They are also friendly and kind. There are about forty kinds of dolphins in the world. They need air to [beak|breathe|clever|fast|swim|tail|teeth]. Dolphins are warm-blooded mammals. They have got sharp [beak|breathe| clever|fast|swim|tail|teeth] and their mouth looks like a bird's [beak|breathe|clever|fast|swim|tail|teeth]. They eat fish and small sea animals. They move with the help of a [beak|breathe|clever|fast|swim| tail|teeth] and fins. Dolphins can swim very [beak|breathe|clever|fast|swim|tail|teeth] and can jump high out of the water. They use sound signals to communicate with each other.