there is the classic Heinlein test; "if an egg beater does not exist and someone dreams it up and writes about it and later the egg beater is made, that is science fiction" (or something along those lines)
for fantasy, I just apply the unicorn test; if fanciful mythic creatures appear on scene, or people have magical powers, it is fantasy. I'm not entirely certain where that leaves treecats, but it is a start
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