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    Boys and girls, do you know what the largest animal in the world is? You must think it is the elephant.

    In fact, the world's largest animal lives in the sea. It is the blue whale. It can be over 30 meters long.

    A blue whale can weigh more than 150 tons— that is heavier than 30 elephants.

    You may think the blue whale must eat big fish, but in fact it eats only tiny creatures like shrimps. People killed the blue whales for their meat and oil in the past.

    Now nobody is allowed to kill the blue whales.