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The gizzard of various birds which are addicted to eating hairy caterpillars, e.g.
The crop is modified into a large and very rugose triturating apparatus, while the gizzard, thereby relieved of its function, is reduced to the utmost.
A gizzard is present in a few forms. The buccal cavity is sometimes armed with jaws.
Most birds have a gizzard which helps to grind up seeds for example.
This bolus is surrounded, as by a bag, by the cast-up lining of the gizzard.