Knowra Gizzard Gizzard A muscular digestive organ that mechanically grinds food, found in earthworms, many insects, and some fish and reptiles. Its tough walls and, in some species, swallowed particles help break food down.
Peristalsis : Wave-like contractions of digestive-tract muscles that move and mix contents. Contractions propel food through the gizzard and can churn it against the organ’s walls.
Earthworm : A segmented annelid worm that feeds on soil and decaying organic matter. Its gizzard grinds swallowed material after it passes through the crop.
Digestive system : The organs and tissues that take in food, break it down, absorb nutrients, and eliminate waste. A gizzard is one specialized organ within this system.
Gastric mill : A set of hard, movable structures in some crustaceans’ stomachs that crushes food. It performs gizzard-like grinding within a stomach rather than a separate muscular chamber.
Cuticle : A protective outer layer secreted by the epidermis of arthropods and other animals. In many insects, a tough cuticular lining protects the gizzard from abrasive food.
Grasshopper : A plant-eating insect in the order Orthoptera, with enlarged hind legs for jumping. Its foregut gizzard helps process food after it leaves the crop.
Foregut : The anterior region of the digestive tract, extending from the mouth to the midgut. In insects, the gizzard is a foregut structure.
Avian gizzard : The muscular stomach chamber of birds that grinds food, often with swallowed grit. Birds have a familiar version of the same mechanical digestive adaptation.
Gastrolith : A stone swallowed and retained by an animal, often aiding food processing in the digestive tract. Some gizzards use swallowed stones as grinding surfaces.
Crayfish : A freshwater crustacean resembling a small lobster. Its stomach contains a gastric mill that mechanically breaks down food.
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