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📕 参考文献
・従来の定説:サルの発声器官の可動域は狭い
Vocal Tract Limitations on the Vowel Repertoires of Rhesus Monkey and other Nonhuman Primates / Lieberman et al.
www.science.org/doi/pdf/10.11...
・サルの発声器官は実は結構柔軟である
Monkey vocal tracts are speech-ready / Fitch et al.
www.science.org/doi/10.1126/s...
・ゴリラのココに関する資料
www.koko.org/
www.nationalgeographic.co.uk/...
・サルの手話に関する懐疑的な論評
Monkey Business / Martin Gardner
www.nybooks.com/articles/1980...
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