Why do we need to breed new species?

Fruit farmers try to grow good-looking apples or those resistant to diseases. The aim is to prevent crop failure and earn more money. Even in animal breeding, the attempt is to breed animals which provide more milk or meat. This is achieved, for instance, by 'crossing' two species with each other. By cross-breeding a good milk-yielding cow with a weather-resistant bull, we can get a hardy, weather-resistant milking cow. We can also try to save endangered species by breeding them in zoos.