These are terrestrial animals found in shrubs, abandoned buildings, rock piles, fallen logs, trees, and, as the common name suggests, along fence lines. Locations with good protective cover are competed for (Tinkle and Ballinger, 1972). The lizards tend to use the same perch to sleep on over extended periods when weather conditions permit (Kennedy, 1958). They have well-defined home ranges; territoriality is another likely reason for the choice of nighttime perch location. Additional hypotheses related to nighttime predation as well as temperature variation have been proposed (Kennedy, 1958). During the day, like most exothermic lizards, S. undulatus is most often found thermoregulating in sunny spots (Angert et al., 2002; Angilletta, 2001)
Angert, A. L., Hutchison, D., Glossip, D., and Losos, J. B. 2002. Microhabitat use and thermal biology of the collared lizard (Crotaphytus collaris collaris) and the fence lizard (Sceloporus undulatus hyacinthinus) in Missouri glades. Journal of Herpetology 36: 23-29.
Angilletta, M. J., Jr. 2001. Thermal and physiological constraints on energy assimilation in a widespread lizard (Sceloporus undulatus). Ecology 82: 3044-3056.
Kennedy, J. P. 1958. Sleeping habits of the eastern fence lizard, Sceloporus undulatus hyacinthinus (Sauria, Iguanidae). The Southwestern Naturalist 3: 90-93.
Tinkle, D. W., and Ballinger, R. E. 1972. Sceloporus undulatus: A study of the intraspecific comparative demography of a lizard. Ecology 53: 570-584.
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