Dolphins(海豚) are not fish. They are mammals(哺乳动物). They live in groups and speak to each other in their own language. But they aren't the same as almost all land animals. Their brains are as big as men's and they live a long life at (little) 20 or 30 years.
Like some animals, dolphins use some sounds to help them find their ways around. They also use sounds to talk to each other and to help them find food. They don't use their ears to receive sounds, use the laws(下颚).
is strange that dolphins are friendly to men. For (thousand) of years, there are many stories about dolphins and men. In the (nineteen) century, in a dangerous part of the sea near New Zealand, there was a dolphin. The seamen liked him so much that they gave him a very good name, Jack. 1871 to 1903, Jack met every boat in the area and showed it the way. In 1903, a passenger on boat with the name of "The Penguin" shot and hurt Jack. (luck), the dolphin didn't die, and after a long time he was well again. He guided the ships through the area for nine more years, but to people's surprise, he refused (help) the boat "The Penguin".
Today, although dolphins (kill) by some people, more people in the world protect them from killing.
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