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It allows them to bite down on grass, then regurgitate it and rechew it as cud with its flat molars when resting. Flat lower incisors act like a flat-bladed knife designed to cut or tear the grass from its lower leaves, and the molars to grind the grass or partly-digested matter it regurgitates and chews as cud. Essentially, teeth of the bison provides the mechanical or physical portion of the digestion of grass.

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12y ago

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