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.
It gets confusing. Instead of a normal venn diagram with circles on a piece of paper I'm imagining at least a 4 dimensional space filled with Klein bottles or something.
A platypus would make in interesting fursona. If I had to choose one I'd pick something as obtuse as possible. The reaction I'd go for is, "What the hell is that? I've never even heard of it." Bonus points if after I show them a picture they insist that it was photoshoped.
Also, I just had this crazy idea of tracking down otherkin with Pokemon as their fursonas and "catching them all." I'd be some kind of mad psychologist.
You're going to have quite the collection of 'stat amps...
Anyone want a 600 EURO AKG K702?
The 65th Anniversary K702 by AKG
The teats they're milking are about to turn black and fall off...