producer, Miles Barton ; director, Will Lawson ; BBC Studios, the Natural History Unit ; a co-production with BBC America, Tencent Penguin Pictures, France Télévisions and CCTV9
produced by David Dugan ; directed by Lucy Haken ; producer, Caitlin Saks ; a NOVA production by Windfall Films (part of the Argonon Group) for WGBH Boston