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Referential alarm calling behaviour in new world primates...that non-human primates can communicate about objects and events in their environment in ways that allow recipients to draw inferences about the nature of the event experienced by the signaller....

commerce international - core.ac.uk - PDF: doaj.org

Review song as an aggressive signal in songbirds... Three criteria are relevant to whether a signal should be classified as aggressive: (1) whether the signal increases in aggressive contexts (the context criterion); (2) whether the signal predicts aggressive escalation by the signaller (the predictive criterion); and (3) whether receivers respond to the signal (the response criterion)....

PDF: faculty.washington.edu