DescriptionAmerican Journal of Psychology (Volume 21) Fig 21.jpg English: The strings were now in Place 4 on left end. Young Crow 1 is shown here as he...
English The same bird as in Fig. 1. String D more directly worked with now than formerly. determination method: SHA-1...
DescriptionAmerican Journal of Psychology (Volume 21) Fig 3.jpg English: Fig. 3 The same English Sparrow as in Fig. 1 opening the door on the next day...
DescriptionAmerican Journal of Psychology (Volume 21) Fig 2.jpg English: Fig. 2 The female English Sparrow (at the lower right hand corner of the box) opening...
DescriptionAmerican Journal of Psychology (Volume 21) Fig 13.jpg English: The female English Sparrow was ready to jump on the top string. The Junco was...
DescriptionAmerican Journal of Psychology (Volume 21) Fig 10.jpg English: The male Sparrow using his combination method. His fear seemed to be one of the chief...
DescriptionAmerican Journal of Psychology (Volume 21) Fig 5.jpg English: The same female English Sparrow using the beak in addition to her claws. The door...
DescriptionAmerican Journal of Psychology (Volume 21) Fig 12.jpg English: The first method used by the Junco in opening the door. She must make many hops...
DescriptionAmerican Journal of Psychology (Volume 21) Fig 6.jpg English: The female English Sparrow of Figs. 1-5. Strings now changed to Place 2. She used...
DescriptionAmerican Journal of Psychology (Volume 21) Fig 11.jpg English: Female English Sparrow opening door by pecking at the knot on the string where...
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