The term for an animal that eats only plants is "herbivore." These organisms primarily consume vegetation, which typically includes leaves, stems, fruits, and seeds. Common examples of herbivores include cows, horses, deer, and elephants. Herbivores play a crucial role in the ecosystem by promoting plant growth, dispersing seeds, and serving as a food source for carnivores. Their digestive systems have evolved to efficiently break down plant materials, often possessing specialized adaptations such as larger digestive tracts or multi-chambered stomachs to process fibrous plant matter effectively.