Guppies (Poecilia reticulata) are deceived by visual illusions during obstacle negotiation

Maria Santacà, Angelo Bisazza & Christian Agrillo
Animals traveling in their natural environment repeatedly encounter obstacles that they can either detour or go through. Gap negotiation requires an accurate estimation of the opening’s size to avoid getting stuck or being injured. Research on visual illusions revealed that in some circumstances transformation rules used to generate a three-dimensional representation from bidimensional retinal images fail, leading to systematic errors in perception. In Ebbinghaus and Delboeuf illusions, the presence of task-irrelevant elements causes us to...
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