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. 2018 Aug 27;8(1):12900.
doi: 10.1038/s41598-018-31331-7.

An Orangutan Hangs Up a Tool for Future Use

Affiliations

An Orangutan Hangs Up a Tool for Future Use

Nicholas J Mulcahy. Sci Rep. .

Abstract

Observational reports suggest that great apes perform tool-orientated actions in preparation for a tool's future use. Some of these observations suggest remarkable planning skills because the target for the tool's intended use was not present during the tool-orientated actions. Although these observational reports are intriguing, such planning ability has yet to be studied experimentally. To address this issue, I conducted two experiments that were inspired by an orangutan's innovative behaviour during a novel enrichment task: the orangutan spontaneously secured a tool he was using to rake-in rewards by hanging it up when it was not in use but would be required a short time later. Experiment 1 showed that securing the tool predominately occurred when the orangutan could anticipate the tool's future use, but rarely occurred when he could anticipate no further use for it. Experiment 2 indicated that the tool's atypical size and/or weight were possible factors that prompted the orangutan to hang up the tool. Overall, the findings suggest that an orangutan not only innovated a novel way of securing a tool, but did so in anticipation of its future use.

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Conflict of interest statement

The author declares no competing interests.

Figures

Figure 1
Figure 1
Riau securing the tool for future use and discarding it when it is not required. (A) Riau is balancing the tool inside the cage lattice in the early stages of the enrichment sessions. (B) In the later stages of the enrichment sessions, Riau wedges the tool inside the narrow gap, which secures the tool quickly and robustly. Hanging up the tool this way was the final method that Riau developed and one he persisted with during test trials in which he could predict its further use. (C) Riau is dropping the tool to the floor in the experimental trials when he can anticipate no further use for it.

References

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