How does a bird's lung function differ from that of humans?

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Why don't birds perched on electric wires get electrocuted?

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Eggs first or chickens?

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Why can't penguins fly?

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Why do chickens lay eggs?

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Why can't chickens fly?

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Do birds have ears?

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Old article/// Why birds don't mind perching on power lines

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Why do birds have feathers?

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How can birds fly?

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Why can cuckoos, parrots, and cockatoos talk?

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Why are crows black?

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