Abstract

The audience effect has been shown in numerous group-living vertebrates but whether it is present in facultatively social species is unknown. We investigated the antipredator responses of the yellow mongoose, a mammal that dens in groups but primarily forages alone. To examine the effect that the social environment has on their communication, we performed a combination of field observations and experiments with live and model predators on a habituated population of mongooses. Social context affected both the communicative and the flight behaviour of yellow mongooses. Alarm vocalizations were used almost exclusively when individuals were in a group rather than solitary. The visual alarm signal, a raised tail, was predominantly used by solitary individuals when predators were outside attack range. This study apparently is the first to show an audience effect in a facultatively social mammal, suggesting that even rare social interactions lead to the ability to respond flexibly to predators depending on the presence or absence of conspecifics.

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