The biggest series ever made by the BBC Natural History Unit, aiming to offer the definitive portrait of the Earth, starts on BBC One on Sunday. Planet Earth, narrated by Sir David Attenborough, took four years to make.
New technology allowed aerial shots of animals that "simply blow the mind", Sir David told BBC's Sunday AM show. A first six-episode run of the series, with footage of some of the most remote areas and rarely-seen animals, will be followed by six more later in the year.
