Description
Adult beaded lizards range from 24 to 36 inches (61 to 91 cm) in length. It is substantially larger than the Gila monster, which only reaches lengths of 12 to 16 inches (30 to 41 cm). Although males are slightly larger than females, the animals are not sexually dimorphic. Both males and females are stocky with broad heads, although the males tend to be broader. The beaded lizard's scales are small, bead-like and non-overlapping. Except for the underside of the animal, the majority of its scales are underlaid with bony osteoderms.
Their base color is black and marked with varying amounts of yellow spots or bands, with the exception of H. h. alvarezi, which tends to be all black in color. The beaded lizard has a short tail which is used to store fat so the animal can survive during months of estivation. Unlike many other lizards, this tail does not autotomize and cannot grow back if broken. The beaded lizard has a forked black tongue which it uses to smell, with the help of a Jacobson's organ; it sticks its tongue out to gather scents and touches it to the opening of the organ when the tongue is retracted.
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