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 (大腦) 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 (頜)。
Clever dolphins
After a long period of studies，scientists are uncovering (揭開) surprising new findings (研究結果) about dolphins (海豚)。
They believe that dolphins do "talk" to each other， whistling "names" among themselves。 They help one another when in trouble。
Like bats， they use sound waves to "see"。 Because of these and many other findings， many scientists now place dolphins among the cleverest animals on earth。
Dolphins love mimic (模仿)。 If we swim on our backs， they follow。 Once when a trainer blew a puff (一口) of cigarette smoke against the window of an observation tank (觀察艙)， a young dolphin suddenly swam to its mother， nursed a moment， and spat out a cloud of milk against the glass。
It is even more surprising that dolphins are able to understand sign language。 One kind of Herman"s dolphins has mastered more than 50 sign words。
And they can also mimic the sign of "speaking" to each other。
Dolphins help one another。When birthgiving takes place，females (雌性) gather to keep off sharks (鯊魚)。
Later， when the swimming mother looks for food，they take care of the young dolphin， swimming in a circle。
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 (大腦) 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 (頜)。
Clever dolphins
After a long period of studies，scientists are uncovering (揭開) surprising new findings (研究結果) about dolphins (海豚)。
They believe that dolphins do "talk" to each other， whistling "names" among themselves。 They help one another when in trouble。
Like bats， they use sound waves to "see"。 Because of these and many other findings， many scientists now place dolphins among the cleverest animals on earth。
Dolphins love mimic (模仿)。 If we swim on our backs， they follow。 Once when a trainer blew a puff (一口) of cigarette smoke against the window of an observation tank (觀察艙)， a young dolphin suddenly swam to its mother， nursed a moment， and spat out a cloud of milk against the glass。
It is even more surprising that dolphins are able to understand sign language。 One kind of Herman"s dolphins has mastered more than 50 sign words。
And they can also mimic the sign of "speaking" to each other。
Dolphins help one another。When birthgiving takes place，females (雌性) gather to keep off sharks (鯊魚)。
Later， when the swimming mother looks for food，they take care of the young dolphin， swimming in a circle。
Dolphins reach out to us in astonishing ways。
What would the world be like without them？
(about 190 words)。