Narwhal The tusks were staples of the cabinet of curiosities. European knowledge of the tusk's origin developed gradually during the Age of Exploration, as explorers and naturalists began to visit Arctic regions themselves. The narwhal was one of two possible explanations of the giant sea phenomenon written by Jules Verne in his 1870 novel "Twenty Thousand Leagues Under the Sea". Verne thought that it would be unlikely that there was such a gigantic narwhal in existence. The size of the narwhal, or "unicorn of the sea", as found by Verne, would have been . For the narwhal to have caused the
Twenty Thousand Leagues Under the Sea an extensive bibliography, appendices and a wide-ranging introduction studying the novel from a literary perspective. In particular, his original research on the two manuscripts studies the radical changes to the plot and to the character of Nemo forced on Verne by the first publisher, Jules Hetzel. The national origin of Captain Nemo was changed in most movie realizations; in nearly all picture-based works following the book Nemo was made into a European. However, he was represented as an Indian by Omar Sharif in the 1973 European miniseries "The Mysterious Island". Nemo is also depicted as Indian in a silent film