• 21
    [Toronto, Ont.] : Canadian Broadcasting Corp., 2009 : CBC Learning [distributor], [2010] [Letterboxed]
    DVD
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  • 22
    BBC ; produced and directed by Dan Child ; produced for NOVA by Melanie Wallace.
    [United States] : PBS Distribution, c2010. Widescreen.
    DVD
    options Options

  • 23
    a production of Passion Pictures, Thirteen and the BBC in association with WNET New York Public Media ; produced by David Allen.
    [Arlington, Va.] : PBS : PBS Distribution, c2011. Widescreen.
    DVD
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  • 24
    CBC Learning in association with National Geographic Channel; series producer, Michael Allder; narrated by David Suzuki.
    Toronto : CBC Learning [distributor], 2010.
    DVD
    options Options

  • 25
    BBC Earth ; 2 Entertain ; a BBC/Animal Planet co-production ; produced by Ian Gray & Mary Summerill.
    Burbank, CA : BBC/Warner Home Video, c2011. Widescreen version.
    DVD
    options Options