Birds

What allows some birds such as chickens to digest hard materials such as seeds?

More Questions from Birds
What is the small iridescent patch on the throat of a hummingbird?
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What is the state bird of Florida?
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What is the common name of the bird Metallura iracunda?
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What is the state bird of Hawaii?
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What is the common name of the bird Columba punicea?
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Which black and white bird can swim but cannot fly?
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What is this bird named after footwear?
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In the northern hemisphere, birds often migrate which direction in the autumn?
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