Abstract
A group of seven pygmy chimpanzees (Pan paniscus) was tested for their mirror-image reactions during a ten-day experiment. The time spent viewing the mirror waned quickly. Little social responses directed towards the mirror were observed. Self-directed behaviors were shown from testday one on. It was concluded that four out of seven animals could correctly identify their mirror-image, one infant was not (yet) able to do so, and for two other individuals the results were inconclusive.
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Walraven, V., van Elsacker, L. & Verheyen, R. Reactions of a group of pygmy chimpanzees (Pan paniscus) to their mirror-images: Evidence of self-recognition. Primates 36, 145–150 (1995). https://doi.org/10.1007/BF02381922
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DOI: https://doi.org/10.1007/BF02381922