Animals have been used for a number of purposes, including for food, as pets, for transportation, as well as for research. All over the world, people keep animals such as dogs, cats, goats, chicken, pigs, and cows. Countless animals are killed every year to provide food. In addition, animals such as horses, ostriches, and camels are used for recreation and championship racing. Most importantly, animals are used in research as a way of learning about living organism, as well as in trying to understand the diseases that cause problems to humans and other animals (Conn 10). Through studies conducted on animals, researchers are able gain knowledge and information that cannot be obtained in any other way.