gizzard
Muscular 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.
© RM 2012. Helicon Publishing is division of RM.
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