Sceloporus undulatus, commonly known as the Eastern Fence Lizard, thrives in forests and rocky outcrops across the eastern United States. It exhibits a rugged, scaly appearance with a distinctive blue belly in males. Known for its quick reflexes, this diurnal reptile aids in controlling insect populations.

Sceloporus undulatus, commonly known as the Eastern Fence Lizard, is native to the United States. Its geographical distribution extends across the eastern and central United States, including regions such as the Midwest, the southern Great Plains, and parts of the southeastern United States. The species is also found in some parts of northeastern Mexico.

The Eastern Fence Lizard typically inhabits areas with dry, open woodland and forested regions. It prefers habitats that offer plenty of sunlight, such as pine forests, oak savannas, and areas with scattered rocks or logs. The species can also be found in dry, rocky outcrops and along forest edges where there is ample sunlight for basking.

Sceloporus undulatus occupies an ecological niche as both predator and prey within its environment. It primarily feeds on insects and other small invertebrates, contributing to pest control in its habitat. Its presence supports a balanced ecosystem by serving as a food source for birds, snakes, and other predators. The lizard's ability to thermoregulate by basking in the sun allows it to thrive in its preferred environmental conditions, adapting to variations in temperature and humidity.