Whales swim by moving their tail fins up and down, and they are able to swim so rapidly With so little apparent exertion because of the ideal propeller construction of their ..tails.
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Bibliographic details
Evening Post, Volume CXI, Issue 35, 10 February 1926, Page 4
Word Count
32Page 4 Advertisements Column 1 Evening Post, Volume CXI, Issue 35, 10 February 1926, Page 4
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