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Nature 430, 732-733 (12 August 2004) | doi:10.1038/430732b; Published online 11 August 2004

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Cognitive science:  Rank inferred by reason

Sara J. Shettleworth1

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Pinyon jays seem to work out how to behave towards an unfamiliar jay by watching it in encounters with members of their own flock. The findings provide clues about how cognition evolved in social animals.

Susan is taller than Billy. Peter is taller than Susan.

  1. Sara J. Shettleworth is in the Departments of Psychology and Zoology, University of Toronto, Toronto, Ontario M5S 3G3, Canada.
    Email: shettle@psych.utoronto.ca

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