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They have a compound stomach consisting of a gizzard and a glandular portion that stores the indigestible parts, called a proventriculus. The proventriculus starts digestion, then passes the digestible parts to the gizzard while storing the others in a ball, or pellet (things like hair, bones, feathers, bills, claws, teeth and plant material). It usually forms the pellet within 10 hours of eating, then expels it.

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14y ago

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