The digestive system of the birds have some unique aspects in that
it stores food temporarily in the crop, and masticates it in the
gizzard rather than in the mouth like the other animals. The
vertebrate gastrointestinal tract is a dynamic organ (Brugger,
1991). The digestive organs of birds consist of the epithelium
derived from the endoderm (Romanoff, 1960). Birds have a digestive
tract (GI tract) that is much shorter (to reduce weight for flight)
and have a specially modified stomach for processing seeds and
plant material. In pigeons, the crop lining changes dramatically
when they are feeding young. Birds depend heavily on their
digestive system to remain nourished and healthy.
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