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. 2021 Jun 25;12:680176. doi: 10.3389/fpsyg.2021.680176

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Copyright © 2021 Kikusui, Sonobe, Yoshida, Nagasawa, Ey, de Chaumont, Bourgeron, Nomoto and Mogi.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Representative figures of 9 call types (A) Call type 1–3. (B) Call type 4–6. (C) Call type 7–9. Calls were classified using 12 acoustic parameters by the k-mean clustering method.