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An adult female orang-utan used an untutored series of physical manipulations to guide humans to food placed beyond her reach. Through a series of experiments that involved different visual occlusions, this orang-utan appeared to take into account humans' visual states when using them to retrieve inaccessible goals. These data suggest that she was able to use her experience with visual barriers to...
To date, it has proven difficult to demonstrate mirror self-recognition in gorillas. However, gorillas display pronounced gaze aversion that may prevent them from spending a sufficient amount of time exploring their mirror images to understand that they are the source of their reflections. It has also been suggested that the presence of observers may inhibit gorillas from engaging in mark-directed...
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