The primary food source for herbivores is plants. Herbivores are organisms that mainly consume plant material, including leaves, stems, seeds, fruits, and roots. This dietary specialization allows herbivores to obtain the necessary nutrients for survival, including carbohydrates, proteins, vitamins, and minerals, from various plant sources. Some common herbivores include cows, goats, rabbits, and deer. They have various adaptations, such as specialized teeth and digestive systems, to effectively process cellulose and other complex carbohydrates found in plant cell walls. This plant-based diet plays a critical role in the ecosystem by contributing to energy transfer within food webs.