David Attenborough's notable episodes include the "Echo of the Elephants" films, which followed scientist Cynthia Moss and cameraman Martyn Colbeck on their lengthy study of an elephant herd in Kenya. In "Attenborough in Paradise" (1996), he fulfilled a lifelong ambition to observe and film the courtship displays of birds of paradise, whilst "The Amber Time Machine" (2004) saw him trace the origins of a piece of amber from the time of the dinosaurs. For "Attenborough's Ark", a 2012 special, he selected his 10 personal favourite species to save on an imaginary ark. The programme drew 3.2 million viewers, the strand's highest audience for eight years. "Natural World"'s most-watched episode also featured Attenborough, this time as the narrator of "Highgrove, A Prince's Legacy" (2003). 4.8 million viewers watched Prince Charles explain the organic farming methods used on his Highgrove House estate.