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  1. A single blowhole, located on the dorsal surface of the head, is covered by a muscular flap. The flap provides a water-tight seal. A bottlenose dolphin breathes through its blowhole. The blowhole is relaxed in a closed position. To open the blowhole, the dolphin contracts the muscular flap.

    seaworld.org/animals/all-about/bottlenose-dolphin/…

    A bottlenose dolphin breathes through a blow hole. The "bottle" on its head is really its rostrum. David Tipling / Getty Images Dr. Helmenstine holds a Ph.D. in biomedical sciences and is a science writer, educator, and consultant.

    www.thoughtco.com/bottlenose-dolphin-facts-4180…
  2. Dolphins Are Exhaling Microplastics - WIRED

  3. Disturbing Discovery: Dolphins Breathe Out Microplastics

  4. Wild dolphins off US Southeast coast found with microplastics in …

  5. Microplastic is Everywhere in the Ocean - Even in Dolphins' Breath

  6. Plastics Are Turning Up in Dolphin Breath - The New York Times

  7. New Study Reveals Dolphins Inhale Microplastics

  8. Dolphins inhale microplastics, according to first-of-its kind ... - CNN

  9. Dolphin Breath Contains Microplastics, Study Finds

  10. Microplastics detected in dolphin breath - ScienceBlog.com

  11. First evidence of microplastic inhalation among free-ranging small ...

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