Idrisova Lia Ahmedovna RussiaКазаньKazan (Volga region) Federal University,, 420008, Казань, ул. Кремлёвская, 18 Graduate Student liya.idrisova@yandex.ru Author's articles Fluctuating asymmetry of pholidosis in grass snakes found on four areas of the Republic of Tatarstan is considered in this article. We carried out the statistical analysis of asymmetrical traits and counted the integral characteristics of fluctuating asym