Animals live as close to the natural habitat as possible. For instance, water and other natural barrieres are used to separate animals from each other and from the visitors. On the other hand, keeping animals in zoos is harmful for them. The animals are forced to live in a unnatural habitat. There is not enough living space in the zoos, when often makes animals unhappy and restless. It is also true that, some animals do not proliferate in zoos. Secondly, animlas should live in freedom, because it is their natural habitat. Moreover, animals in the zoos live under stress. The worst thing is that animals in the zoos will never be able to exsist in their natural habitat alone.