But why were there dryads at all? As far as he could recall, the tree people had died out centuries before. They had been out-evolved by humans, like most of the other Twilight Peoples. Only elves and trolls had survived the coming of Man to the Discworld; the elves because they were altogether too clever by half, and the trollen folk because they were at least as good as humans at being nasty, spiteful and greedy. Dryads were supposed to have died out, along with gnomes and pixies.
