Sperm whales release bubbles to regulate buoyancy and sleep floating vertically, scientists discover – Sky News

United Kingdom
  1. Sperm whales release bubbles to regulate buoyancy and sleep floating vertically, scientists discover  Sky News
  2. Researchers tag 42 sleeping giants in Arctic Circle – and make breathtaking discovery  BBC Wildlife Magazine
  3. Sperm Whale rest vertically (IMAGE)  EurekAlert!
  4. Sperm whales blow bubbles to help them nap  Popular Science
  5. Secrets of how sperm whales sleep revealed  The Telegraph

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