Birds

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

More Questions from Birds
What are tufts of feathers on the head of the bird called?
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Which of the following is not a type of bird?
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What would you call a black and orange bird that eats fruit and nectar?
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What U.S. state nicknamed "Badger State" has the Robin as its state bird?
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What type of bird strikes terror into the hearts of the characters in the movie "10,000 BC"?
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What is the common name of the bird Eupherusa poliocerca?
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Which is the only continent where owls are not found?
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What is the third eyelid of the bird that can be closed for protection?
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