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Viviparous Phrynocephalus lizards (Agamidae) are mainly restricted to the Qinghai-Tibet Plateau of China. In this study, we used Phrynocephalus vlangalii females kept under seven thermal regimes for the whole gestation period to test the hypothesis that viviparity in high-altitude Phrynocephalus lizards is adaptive because embryos cannot fully develop without maternal thermoregulation. All females...
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