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(title in Spanish - 'El hombre es un animal irracional? sobre el concepto de estupidez en los zoomorfismos fraseológicos del polaco y del espanol'). The aim of this article is to analyze the selected phraseological units containing names of animals and having a metaphorical basis which is similar both in Polish and Spanish language. The purpose of the authoress' contrastive investigations, carried out in the area of cognitive linguistics, is to present the similarities and differences between the phraseological units including names of animals in these two languages, from both syntactical and semantical point of view. The subject matters of the following paper are selected zoosemic terms which metaphorically signify foolishness of human being.