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the skill is an example of insightful problem solving by nonhuman primates.  
This problem sollving mechanism shows the fact that chimpanzees posses a certain level of intelligence that considerably higher compared to other mammals. This finding strengthens the evolutionary theory which conveys that humans are the evolved form of primates/
W0lf93
The result of evolution. Learned by watching their human caregivers use keys to open locks. An example of insightful problem solving by nonhuman primates.
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Universidad de Mexico