The pygmy short-horned lizard is often mistaken for its close relative, the
greater short-horned lizard (
P. hernandesi), as both species have much of the same physiology, such as a squat body and small, "horn"-like, pointed scales located along the head, back and side body. It has a "snub-nosed" side profile compared to the sleeker snouts of many lizards, and relatively short legs. The trunk is fringed by one row of pointed scales, while the belly scales are smooth. Their colour is greyish-beige, yellowish, or reddish-brown, depending on seasonality and region. Additionally, there are two rows of larger, dark spots on the back. When ready to mate, or threatened or reacting defensively, this species' colours become more intense (commonly known as "fired-up"). ==Behavior==