How do some hard seeds resist digestion when eaten by an animal such as a bird?
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Most of these birds eat hard items such as seeds and nuts. Birds with thick gizzards frequently pick up grit—little stones, sand, and small shells. These items collect in the gizzard. When food and digestive juices enter the gizzard, the thick muscles and grit help pulverize the food.
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as birds aren't able to digest some hard coated seeds ...but this also helps for growing plants
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