A huge problem in Australia as you probably know where we do get quite a few bush-fires is down to the huge build up in combustible materials. This'd be a fairly modern problem in that the indigenous peoples used to do a lot of the house-keeping by actually setting controlled fires and managing the bush in a sustainable way for themselves. Would that also have been the case for your own indigenous population? It's so bloody dry and the bush is like a tinderbox, lightning strikes certain times of year now cause incredible destruction where years ago they'd have burnt out a few hundred acres and been done with, creating sort of natural corridors and that. I can certainly attest to the speed at which fires move having watched them leaping gorges and seeing sparks dance like sprites across the highway in front and back of my car from a fire a half mile away, fair near shat my pants I can tell you. The fire itself creates its own great wind - you can feel the heat in it. It drives itself along as fast as a car. Far as I know, native animals run towards the fire rather than away from it, and many if not most do escape out the back.