Herbivores are animals that primarily consume plants. They have specialized digestive systems that enable them to break down complex plant materials like cellulose. Herbivores include a wide variety of species such as cows, elephants, deer, and many types of insects. Their diet can include leaves, fruits, seeds, and stems. Because herbivores occupy the second level in the food chain, they play a crucial role in ecosystems, helping to maintain plant populations and serving as prey for carnivores. This diverse group demonstrates fascinating adaptations for their plant-based diets.