An animal that only eats vegetables is called a herbivore. Herbivores exclusively consume plant-based foods, which include various sources such as leaves, fruits, nuts, seeds, and roots. Common examples of herbivores are cows, deer, rabbits, and elephants. Their digestive systems are specifically adapted to break down tough plant materials, often featuring complex stomach structures to help in the fermentation and digestion of cellulose. Herbivores play a crucial role in ecosystems, contributing to plant propagation and serving as prey for carnivorous animals, which helps maintain food chain dynamics.