S2 Ep 26. A very clever solution to a significant environmental problem based on a kingfisher’s eyelids. When the brightly coloured bird dives for food, its eyes are covered in a way that protects the kingfisher’s eyeballs, rather like swimming goggles protect ours. Architects have copied this design to help prevent soil erosion on the banks of the huge Three Gorges Dam in China. Get in touch: www.bbcworldservice.com/30animals#30Animals