In this series Iolo Williams explores the fascinating behaviour of birds in Wales, revealing all aspects of their lives from surviving harsh winters and avoiding predators, to living alongside us in our towns and cities. In this final episode, Iolo explores bird design - from their ability to fly to the way that their beak design, colour and camouflage enable them to live in the many habitats Wales has to offer. Using ultra-slow motion photography, Iolo looks at how garden birds have such control over take off and landing, and explains why fulmars are one of our most supreme fliers.