Otherkin
Okay tell me about the Otherkin, please?
One short-soundbite answer is that Otherkin identify spiritually or emotionally as a different species than that of their body.
More inclusively, otherkin are those who identify as a different species than that which they are perceived to be by the majority population. Some otherkin do identify as physically non-human, although this notion has recently been fairly heavy-handedly being erased from many otherkin resources, a phenomenon that is regretable, as it breeds more alienation within the community.
Try What are otherkin? for a more complete answer.