You may have conflated a couple of things here that I think might be worthy of clarification. 1. Fires will force animals out of the forest for hunting. It sou

You may have conflated a couple of things here that I think might be worthy of clarification. 1. Fires will force animals out of the forest for hunting. It sounds to me that this is the most likely reason for animals learning to spread fire. 2. While I expect sufficiently fierce fires will create plains, much of Australia's native flora is adapted to bush fires, and use it as an opportunity to regenerate. Many plants have seed pods that will only open after being burned. Thus, while much of Australia's bushland is dry, bushland that has been burned recently tends to be quite green and full of life, and many of the trees remain - however much furrier for their fresh growth of leaves. 3. Australian Aborigines (to my best recollection) were known for cycling parts of their territories as part of their nomadic lifestyle, farming somewhere, burning the land as the left, moving on, then returning again later when the land is restored and more plentiful.