Population-Specific Use of the Same Tool-Assisted Alarm Call between Two Wild Orangutan Populations (Pongopygmaeus wurmbii) Indicates Functional Arbitrariness
- Adriano R. Lameira
- , Madeleine E. Hardus
- , Kim J. J. M. Nouwen
- , Eva Topelberg
- , Roberto A. Delgado
- , Berry M. Spruijt
- , Elisabeth H. M. Sterck
- , Cheryl D. Knott
- , Serge A. Wich
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