File:American Journal of Psychology (Volume 21) Fig 17.jpg

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English: Male Baltimore Oriole 2. He, during an earlier trial, flew to this post, slipped off, struck String C and opened the door. He is shown here continuing this wholly unnecessary action.
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Source https://en.wikisource.org/wiki/Page%3AAmerican_Journal_of_Psychology_Volume_21.djvu/62
Author Editor G. Stanley Hall

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Note: This tag should not be used for sound recordings.PD-1923Public domain in the United States//commons.wikimedia.org/wiki/File:American_Journal_of_Psychology_(Volume_21)_Fig_17.jpg

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