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The single spiral tusk of the narwhal inspiration for tales of unicorns and the myriad variations on the twist of the snail shell have delighted and fascinated naturalists and artists since the dawn of civilization.
First Air Date : Jan 29, 2013
Last Air date : Jun 25, 2017
Episode : 27 Episode
Season : 4 Season
Runtime: 22:14 minutes
Country:
Cast: David Attenborough
Crew:
