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Cable News Network, publisher, production company. and Weir, Bill, 1967- host.

Encyclopaedia Britannica, Inc., publisher. and Heintz, Kurt, director, narrator.

British Broadcasting Corporation. Natural History Unit, production company., BBC America, production company., France télévision, production company., Tencent Penguin Pictures, production company., BBC Worldwide Ltd., film distributor., Webb, Theo, director., Barton, Miles, producer., and Attenborough, David, 1926- narrator.

BBC Studios, production company., Thirteen Productions, production company., France télévision, production company., BBC Worldwide Ltd., film distributor., Easton, Nick, director, producer., Place, Anna, director., Douglas, Sara (Television director), director., Williams, Paul (Television producer), director, producer., and Carvel, Bertie, 1977- narrator.

Top Shelf Productions, production company., Clawed Hat Films, production company., Cineflix Productions, film distributor, publisher., Leach, Anton, director., Holland, Brian (Television producer), producer., and Hurst, Michael, 1957- narrator.

Switch International, production company.