Tiny, round-eyed Sengis are a rare mammal found in the African savannah. They create complex trails that are exactly like the roads humans build. The trails protect them against predators. If a Monitor lizard approaches, Sengi will take off in a flash. By speeding along the straightaway and making sharp turns, Sengi will quickly outdistance its pursuer and dart through a T-intersection to hide. Sengis also use the trails to raise their young, the most adorable little creatures ever to appear on Darwin's Amazing Animals. This episode takes a look at these fascinating creatures that spend their entire lives on the road.