Birds

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

More Questions from Birds
Which of the following is true about a Hummingbird?
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What is the common name of the bird Columba argentina?
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On birds, what is the hinge where the mandibles meet?
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What is the common name of the bird Dendrortyx macroura?
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What would you call a black and orange bird that eats fruit and nectar?
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What is the common name of the bird Ardeola idae?
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What is the common name of the bird Ciconia stormi?
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What is the common name of the bird Syrmaticus ellioti?
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