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Gizzard
The gizzard, also
referred to as the ventriculus, gastric mill, and gigerium, is an organ found in
the digestive tract of some animals, including archosaurs(dinosaurs, birds, pterosaurs, crocodiles and alligators), earthworms, some gastropods, some fish and some crustaceans. This
specialized stomach constructed
of thick muscular walls is used for grinding up food, often aided by particles
of stone or grit. In certain insects and molluscs, the
gizzard features chitinous plates or teeth.
From Wikipedia, the free encyclopedia
For
the open source shading framework, see Gizzard (Scala framework).
Cooked duck
gizzards
Seed-eating birds utilize
a unique process in order to digest their hard-shelled diets. Digestive enzymes
cannot penetrate the seed shells (for doves and other species that swallow the
shells) nor, in some cases, the inner seed covering (species that crack seeds
before eating). To get around this, birds have evolved a muscular organ known
as the gizzard, or ventriculus, to help grind their food into smaller pieces.
Seed-eating and
certain other birds increase the gizzard’s effectiveness by swallowing stones
and gravel, which are stored and act as grinding surfaces. These stones are
periodically regurgitated or passed in the feces, possibly to prevent their
becoming smooth and, consequently, less effective. Be sure to always have grit
available to your seed-eating birds, prod or they will not be able to derive
adequate nutrition from even a well-planned diet. Bits of cuttlebone also
help to grind seeds, but only temporarily.
Grit and
Gizzards – how birds digest seeds
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