Birds have no teeth then how do they grind grains they eat as food
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They have specialised organs so they don't tneed the grind like the mammals and other species. They directly put it from their beak.
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Answer:
The mouth opening in birds is bounded by a upper and lower horny beaks which are without any teeth. In grain-eating birds, the cavity of the gizzard (part of the stomach) retains pebbles swallowed by the bird. These stones in the gizzard helps in grinding the food.
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