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Look at the sperm whale（抹香鲸）. It is 15 meters long. Its tail is 8meters long. It's 35 tons（吨）. It has 50 teeth. It often eats small lobsters（龙虾）and fish. It can live in the deep（深的）cold water. It's much longer and heavier than the killer whale（虎鲸）.

The killer whale is 8 meters long. Its tail is 6 meters long. Its 3600 kg. It has 40teeth. It eats fish, birds and other whales. It's a good swimmer. It can jump out of water.