The Evolution of the Earth's Environment

There are earth cultures that have kind of based their lives around the migration habits and life cycles of a distinct animal or a plant during hunter-gatherer sort of societal. This is, this is a great way to kickstart you into thinking about how the cultures of your world will interact with the ecology. James P. Hogan's Giants novels turned some of this on its head a little bit. The one of the discoveries in the books is that these planets had, or this planet, the evolution animal life on the planet had all evolved.