题目内容：

One day，I saw some children trying to catch butterflies.This made me think of my own childhood.

When I was a boy of 12 in South Carolina，we lived near a forest，and every evening mockingbirds(知更鸟) would come to the trees and sing.I was so interested in watching birds.I planned to catch a bird and keep her in a cage so that I could hear  her sing at any time.

I finally caught one.On the second day，the bird's mother flew to the cage with food in her mouth.The baby ate everything her mother brought her.I was glad to see this.The following morning when I went to see my mockingbird，I was surprised to find she was dead in the cage！How sad I was!

When Arthur Wayne，a famous ornithologist(鸟类学家)，visited my father，he heard my crying and told me，“If a mother mockingbird finds her young baby in a cage，she will bring poisonous(有毒的) food to the baby.She thinks that it is better for her child to die than to live in a cage.”

Since then，I never caught any animals and put them in a cage.All living animals have a right(权利) to live free.

1.What was the writer's hobby when he was young？(不超过5个词)

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2.Why was the young mockingbird dead in the cage？(不超过10个词)

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3.What does the writer want to tell us in the story？(不超过15个词)

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