Therians
Therians are individuals who identify as an animal that is known to exist (sometimes, more 'feral' creatures that are not known to exist are included as well, such as dragons and sea serpents). The exact definition of therianthropy varies significantly, a condition increased by the fact that the explanation for therianthropy varies wildly depending on who is being talked to (common explanations include reincarnation, conditioning, abnormal neurology, and abnormal psychology).