The gizzard is how turkeys chew:
A sac of muscle and sinew
Filled with small rocks and grit,
Stomach acid and spit
That each bite of food passes through.
For more Thanksgiving fun, see also:
Also known as “hen’s teeth,” according to Wikipedia, the ventriculus, gastric mill or gigerium is a digestive organ found in archosaurs (birds and other dinosaurs, crocodiles, alligators, pterosaurs), earthworms, some gastropods, some fish, and some crustaceans.” Muscle contractions cause stones, called gastroliths, or grit, such as sand, to grind up ingested matter moving through it.
