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Why did the dinosaurs swallowed a lot of stones?

Gastrolith with grinding food to help digestion. Reptiles and mammals of different teeth, there is no differentiation of form and function. Mammals have specialized teeth grind food white (teeth), and eat the food, especially full of crushed plant food, then absorbed from the gastrointestinal. The reptile is not molars, the teeth of the same species of animal forms are the same. Reptiles cutting action of the teeth only bite, generally do not touch the ground grinding function.

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