Interestingly, most herbivorous animals do not have the ability to digest the cellulose in plants. However, in the absence of this ability, a mechanism has evolved that allows them to survive despite eating only plant matter, namely,

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Many herbivorous animals such as cows, sheep, and termites have bacteria living in their digestive systems that help to break down cellulose. These symbiotic microorganisms produce enzymes called cellulases that break down cellulose into simpler sugars that the animal can digest and use for energy. This mechanism allows herbivores to survive on a plant-based diet.

Interestingly, Most Herbivorous Animals Do Not Have the Ability to Digest