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What are the modifications that are obse...

What are the modifications that are observed in birds that help them fly?

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The various modification in birds that help them in flying are as follows:
(i) The bones, possess air cavities which reduce the weight of them.
(ii) Forelimbs are modified into wings.
(iii) Body is boat shaped
(iv) Sternum is keeled shaped and bear highly developed breast muscles
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