The life expectancy of S. undulatus is not resolved. Most hatchlings and juveniles die, but for those that survive the estimated average life span is 4 years (Adolph and Porter, 1996; Haenel and John-Alder, 2002).
Adolph, S. C., and Porter, W. P. 1996. Growth, seasonality, and lizard life histories: Age and size at maturity. Oikos 77: 267-278.
Haenel, G. J., and John-Alder, H. B. 2002. Experimental and demographic analyses of growth rate and sexual size dimorphism in a lizard, Sceloporus undulatus. Oikos 96: 70-81.
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