, Volume 35, Issue 1, pp 89–93 | Cite as

Effects of familiarity on the behaviour towards intruders in captive common marmosets (Callithrix jacchus)

  • Andreas Koenig
  • Hartmut Rothe
Short Communication


A study on the behaviour of a group of common marmosets (Callithrix jacchus) towards unrelated intruding conspecifics (juvenile male twins) was performed. The group members' proximity to the intruders during two consecutive study periods was analyzed. During the first period in which the experimental conditions as well as the intruders were unfamiliar, all but one group member were equally likely to stay near the intruders and usually more than three individuals were present simultaneously. During the second period the group members showed different scores of proximity towards the intruders. One individual, an adult male, was in close proximity nearly the whole time. Additionally, the number of individuals simultaneously staying near the intruders was clearly reduced. It is argued that (1) the change in behaviour of the group members was affected by the increasing familiarity and (2) intruder experiments with unfamiliar conspecifics are only of partial value for clarification of the process of immigration.

Key Words

Callithrix jacchus Intruder study Familiarity Defending behaviour Immigration 


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Copyright information

© Japan Monkey Centre 1994

Authors and Affiliations

  • Andreas Koenig
    • 1
  • Hartmut Rothe
    • 1
  1. 1.Institute of AnthropologyUniversity of GöttingenGöttingenGermany

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