Crossbreeding is the mating of two animals that are different breeds within the same species. The key to this definition is the term species. Remember, species refers to a group of organisms that have many of the same characteristics, so they naturally mate together.
Examples of a species are the dog species, cat species, horse species, chimpanzee species, or the dolphin species. Scientists believe there are over 8 million species in the world, so this species list could go on and on.