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gizzard |
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gizzardMuscular grinding organ of the digestive tract, below the crop of birds, earthworms, and some insects, and forming part of the stomach. The gizzard of birds is lined with a hardened horny layer of the protein keratin, preventing damage to the muscle layer during the grinding process. Most birds swallow sharp grit which aids maceration of food in the gizzard. |
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In ostriches, the muscle contractions in this gastric mill occur two to three times per minute, says Oliver Wings of Germany's University of Bonn. |
gastric mill
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