produced by Steven Latham, Larry Klein, Evan I. Schwartz ; written by Larry Klein and Evan I. Schwartz ; directed by Steven Latham ; a Steven Latham production for WGBH/NOVA
narrated by Joe Morton ; produced by Llewellyn Smith, Kelly Thomson ; written and directed by Llewellyn Smith ; Nova production by BlueSpark Collaborative, LLC for WGBH Boston
produced and directed by Paul Thompson ; a BBC Studios Natural History Unit production for PBS ; a BBC Studios production for PBS, BBC and Tencent Penguin Pictures ; a BBC partnership with Open University
produced by Kendra Gahagan, Daniel McCabe ; written by Daniel McCabe ; directed by Daniel McCabe, Jaroslav Savol ; a Nova production by Big House Productions Inc for GBH Boston
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