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I was born in a small river. I did not know my father or mother, but I had many brothers and sisters. At that time I had a long tail(尾巴), but no legs. So I looked like(看起来像) a fish. Then my tail became shorter and shorter(越来越越短). And now I have four legs and a very short tail. My tail will be lost at last. Then I'm going to jump out of the water. I'm going to live on the land and in the water too. What am I?
 

A. I was born in the water. B. I have got four legs. C. My tail becomes shorter. D. I have a long tail but no legs. E. I jump out of the water.