Morphometric characteristics of Bombina bombina males and females were done. 10 traits were measured and 10 indices were calculated for a sample of B. bombina from the population of the lake Cherepashie (the Medveditsa river valley, Lysogorsky district, Saratov region). Only some traits show significant sex-ual differences in B. bombina. It is shown that in the conditions of degradation of the spawning reservoir network in river valleys, a significant increase in the role of individuals with relatively large dimensions of their hind limbs (mainly femur) occurred in the B.