A muscular stomach found in birds and some other animals, used for grinding up food.
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The gizzard.
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The function of an earthworm's gizzard is that the gizzard
grinds organic matter.
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All birds have a gizzard.
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The gizzard is a digestive organ that helps breakdown food in the earthworm. similar to the turkeys gizzard. The turkey also has a gizzard that serves the same purpose.