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Watch Natural World Season 23 Episode 5 Online

  • 7/10
  • COUNTRIES: United Kingdom,France
  • Subtitles: English

Profile of the hammerhead shark, which has until now been shrouded in mystery as no-one could understand why its head is such a strange shape, or how it might help the creature's survival. Marine biologists in Hawaii explain how the fish utilises the unusual shape to give it a unique, deadly weapon in the oceans. Narrated by Ian Holm