Why do you have hybrids?

To get features of two creatures into one, an example is the mule, which is a cross between a donkey and a horse, by combining the horses strength and with the donkeys compactness, the result is an animal which allows the rider to easily transverse rough, mountainous terrain.

Hybrids are also intermediate stages of making a new breed, a lot of dog breeds are the result of breeding specific pedigrees together, an example is the Labradoodle.

Sometimes hybrids are accidents, such as Ligers.