Answers

2014-07-10T19:57:58+05:30
Birds are aerial animals, they can fly because of their light body and hollow bones .
there are too many varieties of birds .

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2014-07-11T17:22:08+05:30
HI i too study in 6 th I can tell you easily

there are a lot of birds like - Kingfishers , woodpeckers  sparrows etc. but  they fly because they have hollow bones and light feathers which helps them to fly

hope it's enough
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