Aligadzhiev El’peli RussiaMakhachkalaDagestan State University, 43a Gadzhieva St., Makhachkala 367025, Russiacherlin51@mail.ru Author's articles Thermobiological characters of toad-headed agamas (Phrynocephalus mystaceus) (Reptilia, Agamidae) on the Sarykum dune (Dagestan, Russia) obtained by using of temperature loggers