These Wyoming herbivores consume vegetation as their source of food. But plants contain cell walls that are composed of cellulose and mammals are unable to digest this material. To overcome this limitation, some mammals have developed a compartmentalized stomach and employ bacteria to help breakdown cellulose. Mammals with this type digestive system also chew their cud and are collectively known as ruminates. All of Wyoming’s large herbivores are ruminates - except the feral horse. The horse is very inefficient in processing its food, as is evidenced by the mostly undigested material found in its dung. It gets around this limitation by “eating like a horse.”
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