1. Scoia'tel
2. Squirrels
3. Sciurus carolinensis
I literally just cracked open Time of Contempt this morning for this first time, so great timing. So excited!
EDIT: Okay, why the Aen Sidhe? They're a really fascinating people. They're fighting this desperate war, believing themselves on the brink of extinction, and raising hosts of dwarves and half-elves and such to their cause. They fight brutally and horrifically, and in their turn the humans act brutally and horrifically upon them - and it's all basically for nothing. Who are the great winners of the Scoia'tel's war? Filavendrel, the last free elf, starving to death on the edge of the world? Francesca, the only elf with any power, but who derives it in spite of her species, not because of it? Iorveth and Isengrim, who were little better then mercenaries? No.
The elves are acting out the last gasp of their species before their extinction. The Aen Sidhe are dead, and were dead ever since Aelirenn led her great host into death all those centuries ago. Despite their long lives, almost all the elves are infertile. There won't be baby elves - almost all of the new elves will be half-elven, raised among the humans and without any elven culture. The ruins of Shaerrawedd are emblematic of the elves: beautiful, well tended, and yet only slipping deeper and deeper into decay.
And I'm not sure that much can be done by the time of the books and the games. Saskia and Iorveth were doomed. Filavendrel was an idiot. Francesca might have had a chance, but that depended on Emhyr's sufferance, and he would have had no more mercy then Radovid or Foltest. And, really, I think most of the Aen Sidhe know this. The sane ones, the smart ones, are content to assimilate. They're whores and thugs and moneylenders, the dregs of society, even less accepted then the dwarves, halflings and gnomes, but they're alive. They might have kids, they might preserve a syncretized, assimilated elvish culture. But the proud ones, the angry ones? They raise Aelirenn's standard, pin a squirrel tail to their hats, and fight to the death. It's tragic, and fascinating.