Doug Allan relives his remarkable career and Gordon Buchanan confronts a huge polar bear. Narrated by David Attenborough - the first episode of this stunning new series reveals the hardships and hazards involved when filming wildlife in the world's most extreme environments - the Arctic and Antarctic.

Gordon Buchanan and Mark Smith reveal how skills learned in Scotland helped in their work. Some of the world's rarest and most dangerous animals live on dry land. Capturing them on film requires great patience and specialist skills.

John Aitchison and Mark Smith reveal some of the unlikely places they have filmed birdlife Filming the wildlife in our skies stretches the skills of any wildlife cameraman. Birds move in three dimensions and constantly change direction so keeping them in the frame and in focus is challenging. In the third episode of this illuminating series, Scots-based cameramen John Aitchison and close friend Mark Smith reveal some of the more unlikely corners of the world where they have filmed birdlife - from a rubbish dump in Dehli to a motorway flyover near Birmingham.

Wildlife cameramen Doug Anderson and Doug Allan head to the depths of the ocean, revealing the techniques involved in filming beneath the waves. Along the way they encounter animals as diverse as white-tip sharks, blue whales and the weedy sea dragon, a tiny creature whose courtship dance is as tender and graceful as any ballet.