File:American Journal of Psychology (Volume 21) Fig 13.jpg

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English: The female English Sparrow was ready to jump on the top string. The Junco was standing by uttering a series of plaintive notes. These two birds often fought each other for the position in front of the strings.
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Source https://en.wikisource.org/wiki/Page:American_Journal_of_Psychology_Volume_21.djvu/42
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_13.jpg

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current21:44, 23 June 2021Thumbnail for version as of 21:44, 23 June 20211,453 × 1,033 (1.41 MB)Sp1nd01Uploaded a work by Editor G. Stanley Hall from https://en.wikisource.org/wiki/Page:American_Journal_of_Psychology_Volume_21.djvu/42 with UploadWizard

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