Our study of the Phrynocephalus mystaceus mystaceus (Pallas, 1776) intrapopulation group on the Sarykum sand massif was carried out during the breeding seasons (1st ten days of May) in 2021 – 2024. In this part of the habitat, the species forms local groups with a very high population density (from 72.9 to 95.7 ind. / ha). Apparently, this is due to the island position of the population on the Sarykum.
