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Chimpanzee quiet hoo variants differ according to context.

Catherine Crockford1,2, Thibaud Gruber2,3,4, Klaus Zuberbühler2,5,6

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Chimpanzee quiet

Keywords:
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Area of Science:

  • Primate communication
  • Animal behavior
  • Evolutionary biology

Background:

  • Animal quiet calls are understudied in communication evolution.
  • Chimpanzee 'hoos' are thought to maintain social contact, especially with bond partners.

Purpose of the Study:

  • To examine the vocalization diversification of chimpanzee quiet 'hoos'.
  • To identify potential pressures promoting this diversification in different contexts (travel, rest, alert).

Main Methods:

  • Acoustic analysis of chimpanzee 'hoos' from audio recordings of wild chimpanzees (Pan troglodytes schweinfurthii) in Budongo Forest, Uganda.

Main Results:

  • Three acoustically distinguishable, context-specific 'hoo' variants were identified.
  • Each variant elicits specific receiver responses crucial for maintaining social cohesion.

Conclusions:

  • Natural selection has driven acoustic diversification of chimpanzee quiet 'hoos'.
  • Diversification is favored by shared goals of maintaining social cohesion and demands of cooperative activities.