Animals are classified into three categories on their eating habit. They are the herbivores, carnivores and omnivores. An herbivore is an animal that gets its energy from eating plants. Many herbivores have special digestive systems that let them digest all kinds of plants, including grasses. Examples of these animals are elephants, cows and sheep. A carnivore is an animal that gets food from killing and eating other animals. Carnivores generally eat herbivores but can eat omnivores and occasionally other carnivores. Animals that eat other animals, like carnivores and omnivores are important to any ecosystem, because they keep other species from getting overpopulated. Examples of these animals are leopards, fox and tigers. An omnivore is a kind of animal that eats either other animals or plants. Some omnivores will hunt and eat their food, like carnivores eating herbivores and other omnivores Omnivores eat plants such as fruits and vegetables. Examples of these animals are bear, dogs and chicken.