Specific morphology of S. undulatus varies based on geographic location. However, this species follows Bergmann’s Rule of body size, which states that body size increases with latitude, which in turn is correlated with decreasing temperatures (Du et al. 2012). The species is sexually dimorphic.
Du, W., Warner, D. A., Langkilde, T., Robbins, T. R., and Shine, R. (2012). The roles of pre- and post-hatching growth rates in generating a latitudinal cline of body size in the eastern fence lizard (Sceloporus undulatus). Biological Journal of the Linnean Society 106: 202-209.
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