• 33 Animals
• 21 Natural history
• 15 Ecology
• 11 Physical geography
• 10 Adaptation (Biology)
• 10 Biodiversity
• 10 Life (Biology)
• 10 Marine ecology
• 9 Habitat (Ecology)
• 9 Marine biology
• 8 Oceanography
• 7 Animal behavior
• 7 Marine biodiversity
• 7 Ocean
• 4 Marine animals
• 2 Animal ecology
• 2 Animal migration
• 2 Biotic communities
• 2 Coral reefs and islands
• 2 Desert ecology
• 2 Deserts
• 2 Forests and forestry
• 2 Grasslands
• 2 Ocean waves
• 2 Plants

• 52 Attenborough, David, 1926-
• 52 Discovery Channel (Firm)
• 28 BBC Earth (Firm)
• 19 Fothergill, Alastair
• 11 France télévision
• 11 Holmes, Martha, 1961-
• 11 Nihon Hōsō Kyōkai
• 8 Barrington, Rupert
• 6 Bass, Karen
• 6 Open University
• 6 Wanda Distribución de Films
• 5 Berlowitz, Vanessa
• 4 Barton, Miles
• 4 Byatt, Andrew
• 4 Pearson, Hugh
• 3 Brownlow, Mark
• 3 Cordey, Huw
• 3 Linfield, Mark
• 2 Bassett, Peter (Documentary television producer)
• 2 Chapman, Adam
• 2 Gray, Ian (Documentary producer)
• 2 Hugh-Jones, Tom
• 2 Lucas, Neil

• 52 English

• 11 Earth (Planet)
• 7 Arctic regions
• 7 Polar regions
• 6 Antarctica
• 4 Africa
• 1 Africa, Eastern
• 1 Alaska
• 1 Botswana
• 1 British Columbia
• 1 Congo River
• 1 Congo River Valley
• 1 Everest, Mount (China and Nepal)
• 1 Himalaya Mountains
• 1 Kalahari Desert
• 1 Okavango River Delta
• 1 Okavango River Delta (Botswana)
• 1 Sahara
• 1 Serengeti Plain
• 1 Serengeti Plain (Tanzania)
• 1 South Africa
• 1 Tanzania

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