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  1. イッカク - Wikipedia

  2. Narwhal | Habitat, Tusk, & Facts | Britannica

  3. Narwhal, facts and photos - National Geographic

  4. ADW: Monodon monoceros: INFORMATION

  5. Monodon monoceros - Society for Marine Mammalogy

  6. 他の人はこちらも質問
    The scientific name, Monodon monoceros, is derived from Greek: "single-tooth single-horn". The narwhal is most closely related to the beluga whale ( Delphinapterus leucas ). Together, these two species comprise the only extant members of the family Monodontidae, sometimes referred to as the "white whales".
    en.wikipedia.org
    He later assigned it as "Monocerote". Its name is derived from the Old Norse word nár, meaning "corpse", possibly in reference to the animal's greyish, mottled pigmentation, and tendency to remain motionless when at the water's surface (called "logging"), typically occurring in the summer.
    en.wikipedia.org
    "Bohaskaia monodontoides, a new monodontid (Cetacea, Odontoceti, Delphinoidea) from the Pliocene of the western North Atlantic Ocean". Journal of Vertebrate Paleontology. 32 (2): 476–484. Bibcode: 2012JVPal..32..476V. doi: 10.1080/02724634.2012.641705. ISSN 0272-4634. S2CID 55606151.
    en.wikipedia.org
  7. Narwhal | NOAA Fisheries

  8. Narwhal - Facts, Diet, Habitat & Pictures on Animalia.bio

  9. The Narwhal: Species Facts, Info & More | WWF.CA

  10. Narwhals ~ MarineBio Conservation Society