I was born in a small river. When I was young, the river was my home. I did not know my father or mother, but I had many brothers and sisters. I swam and played with them. At that time. I did not look like my father or mother. I had no legs, but I had a long tail. So I looked like a fish. Then my tail became shorter and shorter. And now I have four legs and a very short tail. I know I'm going to have no tail very soon. I'm going to be like my father and mother. Then I' m going to jump out of the water. I'm going to live on the land and in the water,too. I'm going to eat a lot of bad insects (昆虫). Do you know who I am?