an IWC Media production for the BBC ; produced by Michael Simkin and Ross Harper ; directed by David Wilson, Ishbell Hall, Michael Simkin and Ross Harper
produced by Spectrum Field Productions LLC for Animal Planet ; executive producers, Guy Nickerson, Jim Rapsas ; director, Guy Nickerson ; producer, Sara Helman
1895 Films a Tom Jennings production for National Geographic Channel International and PBS ; director, Tom Jennings ; producer & editor, David Tillman ; producer, Liza Maddrey
The British Film Institute, Film4 and Hopscotch Films present ; a Hopscotch Films production ; written, photographed, and directed by Mark Cousins ; producer, John Archer
filmmaker, Anne Makepeace ; researcher and assistant producer, Jennifer Weston ; a co-production of Makepeace LLC and the Independent Television Service (ITVS) ; presented by WGBY