blue whale can grow to be more than 27 metres long,and can weigh 150 tonnes. They have huge tails which they use to bush themselves through the water. They can swim as fast as
30 kilometers an hour.but blue whales are not fish.they cannot breathe underwater,but they can stay there for twenty-five minutes. Sometimes they swim more than 100 metres down below the surface. When they come up to water shoots 9 metres into the air