This isn't a quibble - it's just so weird that I don't know where to put it, so here will do. Re-reading AGoT, I came across a passage that has my set little mind awhirl with nightmarish Darwinian visions. Dany and the khalasar are riding across Essos, heading for Vaes Dothrak:

"For half a moon, they rode through the Forest of Qohor, where the leaves made a golden canopy high above them, and the trunks of the trees were as wide as city gates. There were great elk in that wood, and spotted tigers, and lemurs with silver fur and huge purple eyes..."

Is this a hint at Targaryens having some different evolutionary path to everyone else?!