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what sort of creature will evolve to fill the niche we leave vacant when our own finally bites it, will depend on what sort of conditions we will have left for it to evolve into.
yes there are a number of now living species that might be prime source stock, but by the time that time comes, they'll be no more recognizable from today's living ancestors of their future, then we are, from the protohominids of our own ancient past.
it really just depends on the specifics of what particular kind of mess we leave behind in the proccesss of doing ourselves in.
i love to think of a world with intelligent beings prettier then us half ugly primates, and still covered in our own floofy fur. but that's just what some of us dream of. what natures does, consists partially of rolling dice. more specificly rolling dice every time a stray cosmic ray partical passess through someone who will subsiquently mate, and then keeping the die rolls that work.
that's how they say, we got here, whatever may have set the proccess in motion and wrote the algorythim for it in the first place.
my nation is the imagination