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What are the plant-eating animals called?

An organism that mostly consumes plants is a herbivore. The size of a herbivore can range from tiny insects like aphids to enormous, hulking elephants. 

The food web, which describes the species that consume other organisms in the wild, is largely composed of herbivores. 

Since plant materials are harder to digest than animal prey, a major portion of herbivores have mutualistic gut bacteria that aid in this process.