There was a short series on the Discovery Channel (I have it on DVD :D ) called, "The Future Is Wild", about the geological, climatory, and most intsresting, biological changes that could take place on Earth in the future. There was a segment for 5 million years, 100 million, and 200 million years. According to them, in 200 million years, the "new humans", that is, the next sentient species, will be a form of terrestrial squid, evolving from swinging throguh tree ( :XD: ) to building civilizations. They have been dubbed, "Squibbons" I remember seeing that on tv a couple months back; it was pretty interesting except it seemed like a bunch of crap for some part, but you never know what nature could do.