The paper compares two variants of thermobiological studies of toad-headed agamas (Phrynocephalus mystaceus) – the traditional one, based on route trapping and measurements of body temperature in captured lizards, and the new one, using temperature loggers that register body temperature once a minute and implemented interperitoneally. Both work options are not alternative. The main thing is the correct interpretation of the results: the traditional method provides data obtained from many individuals characterizing the temperature parameters of the activity of the studied reptiles.