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Population-Specific Use of the Same Tool-Assisted Alarm Call between Two Wild Orangutan Populations (Pongopygmaeus wurmbii) Indicates Functional Arbitrariness

Figure 2

Percentage emitted by habituated and unhabituated individuals at Cabang Panti for unaided kiss-squeaks and leaf kiss-squeaks.

Figure 2

doi: https://doi.org/10.1371/journal.pone.0069749.g002