Birds

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

More Questions from Birds
Which of these birds is extinct?
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What bird lives in Antarctica?
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What is the common name of the bird Egretta vinaceigula?
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What is the upper front part of a bird called?
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What are a bird's large, conspicuous, showy feathers called?
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What is the common name of the bird Gorsachius goisagi?
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What is the common name of the bird Chlorostilbon auriceps?
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About how many species of birds are there in the world?
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