Question

why there is a need of abdomen in birds
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Answer 1

Answer:

Birds have a glandular stomach, or proventriculus, and muscular stomach or gizzard. ... A complex cycle of contractions involving the two stomachs force feed back and forth between the two, grinding it and increasing exposure to digestive enzymes.

Answer 2

Answer:

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Birds depend heavily on their digestive systems to remain nourished and healthy. Many birds can starve in hours if deprived of food, therefore, their digestive system is faster and more efficient than those of other vertebrate groups. ... It begins with entry of food via the beak and ends with waste exiting at the vent.......

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