This is a TV series which sets to hypothesise what might be living on the Earth thousands to millions of years from now... The immediate question is "How can anyone possibly know?". Well, they don't. The point is to make educated guesses at what may exist, and this it does well. The creatures are all based on modern day or even extinct species, and have been suitably altered and placed in an environment of the future. Rudimentary but acceptable computer graphics are used to show the animals in their 'narural' habitats. It is narrated, and also has insights from biologists and zoologists who suggest how the animal might live. All very questionable, but still entertaining.