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Their forelimbs are modified to wings for flight.
their bones are hollow so that their body doesn't weighs much and it is easier to fly high and long.
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1: they have wings to fly .
2: forelimbs of bird are modified in to life . 
3: shape is streamlined .
4: exoskeleton is lighter 
5: bones are hollow which decreases there weight . 
             i hope it helps......................^_^
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