, Volume 23, Issue 1, pp 138–139 | Cite as

An unusual instance of tool-use among wild orang-utans in tanjung puting reserve, indonesian borneo

  • Birute M. F. Galdikas
Short Communications


Despite several recent orang-utan (Pongo pygmaeus) field studies in Borneo and Sumatra, tool-use has never been reported among wild orang-utan populations in contexts other than agonistic displays or nesting/covering behaviors. During a continuous 9-year study at Tanjung Puting Reserve, Central Indonesian Borneo, only one instance of wild orang-utan tool-use outside these two contexts was observed: an adult male orang-utan broke off a dead branch and used it to scratch his rear for half a minute.


Field Study Animal Ecology Dead Branch Pongo Pygmaeus Agonistic Display 
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Copyright information

© Japan Monkey Centre 1982

Authors and Affiliations

  • Birute M. F. Galdikas
    • 1
  1. 1.Simon Fraser UniversityCanada

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