produced & directed by Rosie Thomas ; BBC Studios, the Natural History Unit ; a co-production with BBC America, Tencent Penguin Pictures, France Télévisions and CCTV9
narrated by Paul Christie ; directed & produced by Tom Mustill ; AGB Films with Gripping Films for Thirteen Productions LLC and BBC in association with WNET
hosted and narrated by Chris Morgan ; a Mike Birkhead Associates production in coproduction with Thirteen in association with WNET ; producer, Mike Birkhead, Joe Loncaine
narrated by Jimmy Smits ; directed and written by Peter Fison ; producer, Charlotte Lathane ; a Windfall Films West Production part of the Argonon Group for Thirteen Productions LLC and BBC Studios in association with WNET