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Rabbits may have a surprising source of calcium — eating their own teeth. Rabbits' teeth grow continuously, and bunnies wear them down by munching fiber-rich foods. Scientists suggest rabbits recycle a fine powder resulting from this constant grinding to fuel tooth growth.

Rabbits' teeth grow continuously, and bunnies wear them down by munching fiber-rich foods. Scientists suggest rabbits recycle a fine powder resulting from this constant grinding to fuel tooth growth.

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