Birds

On birds, what is the hinge where the mandibles meet?

More Questions from Birds
What are soft webbed feathers on the side of the bird's head?
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What is the state bird and state tree of North Dakota?
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What is this bird named after footwear?
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A group of which people sparked the First Jewish-Roman War by sacrificing birds near a synagogue?
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Where did the Cockapoo originate?
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What is this bird that can repeat sounds?
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What is the common name of the bird Phaethornis longirostris?
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What is the state bird and state tree of West Virginia?
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