Dolphins also show their feelings with sounds. (p.8)
In this book, you can know about dolphins very concretely. According to this book, there are about 37 kinds of dolphins and no dolphins have the same sound. All dolphins use their own sound. They use the sounds to tell others "I'm here."
If you read this book, you must be interested in dolphins more!!
Sarah L. Thomson, (2006) Amazing dolphins! British: HarperCollinsPublishers
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