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Birds, Unlike mammals, have hollow bones. This makes their skeletal structures light enough to allow prolonged flight. Bats, on the other hand, have solid, marrow-filled bones. They require the extra force generated by a broader wingspan to lift their bodies and propel themselves through the air.

Simple answer: Bats have heavier bodies by size.

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Q: Why do birds have a wingspan roughly twice that of their body length while bats have a wingspan roughly five times that of their body length?
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