So, continuing with the furry discussion...
They aren't mutually exclusive, and I think one could make an argument for something akin to a venn diagram, as some otherkin could be considered furries or scalies (totem animals, werewolves, dragons, etc.) while others not (ie. elves). One could be part of the furry fandom and be an otherkin. The key distinction I think that makes for an 'otherkin' label is the genuine belief that one either WAS such a creature in a former existence, or one IS currently such a creature in some capacity. I think non-otherkin furries recognize / admit they are human, in other words.
As I was saying with a former post, I find the demographics and subsequent stereotypes that exist within fandoms rather fascinating. Especially with regard to furries, when certain people are prejudged by other furries based on their choice of fursona (kind of ties in with a_rec's post about music...). I think it's rather humorous that there are people with more 'exotic' fursonas who look down their noses snouts at people with more common ones. "Oh look, another fox / wolf / cat / dog" type thing. LOL.
How many pages already discussing about furries? It's the longest I have ever seen lol.