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Context-dependent alarm responses in wild vervet monkeys.

Adwait Deshpande1,2,3,4, Erica van de Waal5,6, Klaus Zuberbühler7,5,8

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Area of Science:

  • Primate communication
  • Animal behavior
  • Bioacoustics

Background:

  • Primate alarm calls are sometimes compared to human language.
  • However, many calls are used in multiple contexts, suggesting complex meaning.
  • Vervet monkey alarm calls during predator and intergroup encounters exemplify this complexity.

Purpose of the Study:

  • To test if vervet monkeys use contextual information to interpret alarm calls.
  • To investigate how meaning is attributed to primate vocalizations.

Main Methods:

  • Playback experiments using recordings of male vervet monkey alarm barks.
  • Subjects were exposed to calls during actual intergroup encounters (predator unlikely) versus no intergroup encounters (predator likely).
  • Responses were measured by startle, vigilance, and gazing behavior.

Main Results:

  • Vervet monkeys responded more strongly to alarm calls in predator-likely contexts (no intergroup encounter).
  • This indicates context is crucial for interpreting the urgency and type of threat.
  • Behavioral responses included increased vigilance and gazing towards the caller.

Conclusions:

  • Vervet monkeys actively use contextual cues to attribute meaning to alarm calls.
  • This challenges simple one-to-one mappings between calls and meanings in nonhuman primates.
  • Contextual information is significant for understanding primate communication systems.