Animals that only eat plants are called herbivores. These animals have evolved specialized digestive systems that allow them to effectively break down and obtain nutrients from plant material. Herbivorous diets primarily consist of grasses, leaves, fruits, and seeds. Some common examples of herbivores include cows, elephants, and deer. In contrast, animals that primarily consume meat are known as carnivores, while those that eat both plants and animals are referred to as omnivores. The classification of animals based on their diet plays a crucial role in understanding ecosystems and the relationships between different species.