Why do birds have hollow bones in 3rd standard
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Answer:This is because it helps them fly in air. Hollow bones make their body weight lighter and their streamlined body helps them cut through the air friction. Thus these factors help them fly in the air and make them a special class(Aves) of the Vertebrates.
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Birds have thin, hollow bones to lighten their weight and make it easier for them to fly. They also have a lower number of bones than other animals because the bones have fused together.
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