Dolphins live in water but they are not fish.They need air to breathe.They can stay under the water for many minutes but then they must come up to the surface.Some dolphins live in sea;some dolphins live in rivers .They like warm the best.

Sometimes dolphins swim close to ships.They jump out of the water again and again.They can swim very fast — up to 55 kilometres an hour.A number of dolphins swimming together is called a `school´.

There are small dolphins and big dolphins:some are two or three metres long.Dolphins are not dangerous.They are very clever animals and they love playing.Dolphins have smiling faces.They `speak´ with high squeaks and clicking sounds.