BBC Earth, Reliance Entertainment and IM Global Present ; a BBC Earth production ; directed by Mike Slee, Patrick Morris, Neil Nightingale ; produced by Myles Connolly, Neil Nightingale, Amanda Hill
directed by Gernot Lercher ; narrated by James Lurie ; produced by Yvette Durrenberger, Elisabeth Faber, Gabriele Wistawel, Heike Lettau, Thirteen Productions
directed by Harald Pokieser ; narrated by Natalia Reyes ; produced by Harald Pokieser, Austrian Broadcasting Corporation Radio & Television (ORF), Cosmos Factory, NDR Naturfilm, Public Broadcasting Service, ARTE, DocLights
director John Murray ; produced by John Murray, Ciara Baker, and Cepa Giblin ; a production of Crossing the Line Production and Thirteen Productions LLC ; in association with WNET [and others]