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The Social Rank of Zoo-Housed Japanese Macaques is a Predictor of Visitor-Directed Aggression

By Jocelyn M. Woods, Stephen R. Ross, Katherine A. Cronin

Category Journal Articles

The effect that visitors have on the behavior and welfare of animals is a widely-studied topic in zoo animal welfare. Typically, these studies focus on how the presence or activity levels of visitors affect animals. However, for many species, and particularly primates, social factors, such as social rank, can also have a large impact on behavior. Here, we considered the influence of both the role of visitors (crowd size and activity levels) and rank on the occurrence of visitor-directed aggression by zoo-housed Japanese macaques (Macaca fuscata, N = 12). We conducted 52 weeks of observation (443.8 h) of macaques living in a large outdoor habitat and recorded 1574 events of visitor-directed behavior, 94.2% of which was characterized as aggressive. We calculated rank using the Elo-rating method. GLMM comparisons indicate that rank was a significant predictor of visitor-directed aggression, with lower-ranked individuals displaying more frequent aggression towards visitors. Additionally, visitor-directed aggression differed by crowd activity levels, but not crowd size. These results support our prediction that rank is associated with differences in visitor-directed aggression, and we interpret this pattern as lower-ranking macaques redirecting aggression toward zoo visitors as safe targets. This work emphasizes how factors emanating from the zoo environment can combine with social dynamics to influence primate response to human presence in the zoo setting. 


Marcy Wilhelm-South

Purdue University

Date 2019
Publication Title Animals
Volume 9
Issue 6
Pages 11
Publisher MDPI
DOI 10.3390/ani9060316
Language English
Additional Language English
Cite this work

Researchers should cite this work as follows:

  1. Animal behavior
  2. Animal welfare
  3. Macaques
  4. open access
  5. Primates
  6. visitors
  7. Zoos
  1. open access