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    • Physical constraints of cultural evolution of dialects in killer whales 

      Filatova, Olga A.; Samarra, Filipa I. P.; Barrett-Lennard, Lance G.; Miller, Patrick J. O.; Ford, John K. B.; Yurk, Harald; Matkin, Craig O.; Hoyt, Erich (2016-11-17) - Journal article
      Odontocete sounds are produced by two pairs of phonic lips situated in soft nares below the blowhole; the right pair is larger and is more likely to produce clicks, while the left pair is more likely to produce whistles. ...