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How do bisons get so big only eating grass?

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Those ruminants may only eat grass and other plant materials, but in fact they are digesting a huge amount of animal proteins in the form of Protozoans. ... rumen, then we have a huge source of protein that is developed there, and when they die the animals digest them to use for building their own muscles. read more

Each day, the bison consumes around 1.6 percent of its body mass. This is equivalent to eating around 24 pounds of grass every day. In a period of one year, the bison consumes around 93 percent of grass, 5 percent of forbs, and 2 percent of browse. The grass consumed by bisons includes blue stem, buffalo grass and gama grass. read more

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