Sharks, geckos, and flies open this episode's case for biomimetics, the practice of mining nature's designs for engineering solutions. The program tracks why sharks swim as fast as they do, how flies and geckos grip smooth glass and even ceilings, and how vultures inform ideas for future airliner wings. Designers of planes, cars, and robots explain what they borrow from these animals, stressing that the goal isn't copying shapes but extracting the underlying mechanical principles and reapplying them, from adhesives modeled on gecko feet to structural ideas drawn from spider silk stronger than steel. Robot cockroaches built as prototypes for all-terrain vehicles get screen time as one of the stranger results of this approach. The footage mixes natural history shots of animals in motion with computer-aided design work and engineers at their benches, letting the camera move between a vulture's wingtip and a wind-tunnel model without much narration standing between the two. It's part of a multi-award-winning series from the makers of Limits of Perception.