Okstein Igor’ L. RussiaMoscowA. I. Alikhanov Institute of Theoretical and Experimental Physics of the National Research Center “Kurchatov Institute”, 25 Bolshaya Cheremushkinskaya St., Moscow 117218, Russia okstain@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