Vocal, gestural and locomotor responses of wild chimpanzees to familiar and unfamiliar intruders: A playback study

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Ecological and social factors affect the occurrence and outcomes of intergroup encounters in chimpanzees (2012, unknown): “Because of strong theoretical (e.g. Wrangham 1999) and experimental (Wilson et al. 2001; Herbinger et al. 2009) evidence that, for chimpanzees, fighting ability and willingness to escalate intergroup contests depend on the number of adult males, we included ‘males’ in all six models.”
The central importance of information in studies of animal communication. (2010, background): “They respond more strongly to a given song type when it comes from an unfamiliar area than when it comes from a familiar area (Brooks & Falls 1975; see also Herbinger et al. 2009).”
Dear enemies or nasty neighbors? Causes and consequences of variation in the responses of group-living species to territorial intrusions (2018, background): “A NN effect has also been demonstrated in other group-living species where neighbors represent a greater threat than strangers: for instance, chimpanzees (Pan troglodytes; Herbinger et al. 2009), the cooperatively breeding cichlid Neolamprologus pulcher (Bruintjes et al.”