Comment on “Ducklings imprint on the relational concept of ‘same or different’”

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Martinho and Kacelnik’s (Reports, 15 July 2016, p. 286) finding that mallard ducklings can deal with abstract concepts is important for understanding the evolution of cognition. However, a statistically more robust analysis of the data calls their conclusions into question. This example brings to light the risk of drawing too strong an inference by relying solely on P values.

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