Why doesn't the elephant have a pleural space?

@article{West2002WhyDT,
  title={Why doesn't the elephant have a pleural space?},
  author={John B. West},
  journal={News in physiological sciences : an international journal of physiology produced jointly by the International Union of Physiological Sciences and the American Physiological Society},
  year={2002},
  volume={17},
  pages={
          47-50
        }
}
  • John B. West
  • Published in
    News in physiological…
    2002
  • Biology, Medicine
  • The elephant is the only mammal whose pleural space is obliterated by connective tissue. This has been known for 300 years but never explained. The elephant is also the only animal that can snorkel at depth. The resulting pressure differences require changes in the pleural membranes and pleural space. 
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