The research was conducted on 40 spines of mature ducks (6 males and 34 females) and 84 spines of 8-week- old broilers of a domestic Pekin duck (42 males and 40 females). The bonem were cooked in a 3 percent solution of Sodium Bicarbonate (NaHCO₃) and then the bones were prepared with the stream of water after softening the remaining fragments of the muscles. After clearing the material, it was bleached with Hydrogen Peroxide (H₂O₂) and then dried at room temperature (16-20^oC). The description focused on features typical of the specimen as well as changes concerning dimorphism and ontogeny. Bone measurement was done with the use of vernier calipers, exact to 0,1 mm. The aim of the research was to determine the numer of vertebrae In particular parts of the spine of currently bred Pekin ducks as well as to show differences in build in connection with a type of locomotion.

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