有关于海豚的英文资料超短的

Dolphins
Dolphins are not fish, but warm-blooded animals. They live in groups, and speak to each other in their own language. In this way they are like other animals, such as bees and birds. But dolphins are very different from almost all land animals. Their brain (大脑) is nearly the same size as human brain, and they live a long time - twenty or thirty years.
Like some other animals, dolphins use sound to help them find their way around. They also make these sounds to talk to each other and help them find food. We now know they do not use their ears to get these sounds, but the lower part of the mouth, called the jaw (颌).

Dolphins are small whales. Although they look like big fish, dolphins are mammals. They breathe air and have live young and feed them milk. They are among the most intelligent creatures on earth.
The average dolphin swims at a rate of between 10 and 15km per hour. If they are being chased, they are capable of swimming much faster, even as fas