The series was created in close collaboration with scientists, filmmakers and animators. Although the future creatures and environments created for the series are all fictional, they were based on evolutionary principles and grounded in science. According to Adams: "If you look at the creatures, you cannot say with any degree of accuracy that this is going to happen, but what you can say is, given certain conditions, creatures like this could develop." Adams felt that it was important that the series would not just be dismissed as "another science-fiction fantasy", but that it would instead be seen as something credible. The geography of the future worlds depicted were designed through collaboration with geologists, and botanists and weather experts were consulted for the future environments. In addition to Dougal Dixon, several other animal experts, biomechanics engineers, and other scientists took part in designing the animals in the series.
