Zoos are scientific centers with living laboratories. Scientists conduct important research in reproductive programs in an attempt to preserve some species. Zoologists can observe the animals mating and giving birth. The natural living conditions of the various species is duplicated. Moreover, scientists can study the habits, diseases, and behavior patterns of the animal at different stages in their lives. That knowledge is used to keep them healthy and contented, The temperature in the enclosed habitats is controlled although the outside temperatures vary. Obviously, such scientific studies in zoos are very beneficial for all of the animals.