The present research work allowed us to define mutual linear and weight proportions of the heart of African ostrich (Strithio camelus) and to show the existing sexual dimorphism. The research was conducted on 19 hearts ( 9 males and 10 females). After preparations, the hearts were weighed exact to a 0,01 g and then linear measurements were done. The results were compiled statistically. The relative weight of male and female hearts was calculated. The results were shown using graphs and tables, whereas morphology of the recorded hearts was shown on photograms. Taking into account the results, it can be noticed that differences of linear and weight parameters of the studied hearts may depend on sex, weight or habitat. It was found that the weight of the left ventricle may be 3 or even 4 times bigger than the weight of the right ventricle. There is a high correlation between the weight of both ventricles and the weight of the left ventricle, height and the weight of the left ventricle and heart circumference and its width. Sexual dimorphism between the examined specimen was found. It was determined that width of the ostrich heart is a parameter feature and has a big influence on sex identification.

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