BBC Earth commercially represents the BBC Natural History Unit, the largest wildlife documentary production house in the world. BBC Earth is responsible for the worldwide marketing and distribution of titles such as Frozen Planet, Life, Blue Planet, and Planet Earth. It has generated sales to over 180 countries.
The BBC Natural History Unit (NHU) is a department of the BBC which produces television, radio and online content with a natural history or wildlife theme. It is best known for its highly regarded nature documentaries, including The Blue Planet and Planet Earth, and has a long association with David Attenborough's authored documentaries, starting with 1979's Life on Earth.
The Natural History Unit is a specialist department within BBC Factual Production, which is itself part of BBC Studios. Each year it produces around 100 hours of television and 50 hours of radio programs, making it the largest wildlife documentary production house in the world.