• Sir David Attenborough is one of the world's best-known and admired wildlife film-makers. His incredible career watching wildlife as a naturalist and broadcaster has spanned nearly six decades. There are very few places on the globe that he has not visited.

    Over the last 25 years he's worked with BBC teams on many landmark BBC series, of which "Planet Earth" was one of the highlights. His first major series "Life on Earth" was watched by an estimated 500 million people round the world. His series are a benchmark of quality in wildlife film-making and have influenced generations of documentary film-makers.

    He is best known for writing and presenting the nine "Life" series, with the BBC Natural History Unit, which together are the most comprehensive TV survey of all life on the planet. He is also a former top manager at the BBC, running the BBC Two channel and was a director of programming for BBC Television in the 1960s and 1970s.

    He was knighted by the Queen in 1985.

    On his 80th birthday, Sir David was on the Galapagos Islands filming the rare giant tortoises, including the famous Lonesome George who was about the same age. "An understanding of the natural world and what's in it is a source of not only great curiosity but great fulfillment," he says. Now 85, he continues to make natural history series and most recently went to the North Pole for the first time in his life, for his latest BBC series, "Frozen Planet."