Polymorphism, pol ee MAWR fihz uhm, is the occurrence of three or more distinct types of adults in a species. For example, there are three types of adult honey bees--queen, worker, and drone. Polymorphism is common among insects, jellyfish, bacteria, molds, and protozoans. Breeds and varieties of domesticated animals and plants, as well as sexual differences, are not examples of polymorphism.