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The interior of the beak is rigid "foam" composed of bony fibers and drum-like membranes sandwiched between outer layers of keratin. The "foam" is covered with overlapping keratin tiles, each about 50 µm in diameter and 1 µm thick, glued together to form sheets.The closed, air-filled spaces reduce overall weight without loss of rigidity.

The interior of the beak is rigid "foam" composed of bony fibers and drum-like membranes sandwiched between outer layers of keratin. The "foam" is covered with overlapping keratin tiles, each about 50 µm in diameter and 1 µm thick, glued together to form sheets.The closed, air-filled spaces reduce overall weight without loss of rigidity.

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