Beaded Lizard

A large, heavy-bodied venomous lizard typically measuring 20–31 inches (51–79 cm) in length, with some individuals exceeding 36 inches (91 cm). Body is robust and cylindrical with a relatively short tail. The head is large, broad, and wedge-shaped. Dorsal coloration is typically dark brown to blackish, often with irregular pale yellow or cream-colored spots, blotches, or crossbands that may form reticulate patterns. The distinctive beaded scales are large, rounded, and prominently keeled, creating a heavily textured, bumpy appearance across the dorsal and lateral surfaces. Ventral scales are smaller, smoother, and cream to yellowish in color. The tail is thick and tapers gradually. The mouth is large and contains venom glands in the lower jaw. The upper eyelid has prominent scale-like projections. Legs are relatively short and stout with strong claws. Juveniles resemble adults but often exhibit more vivid patterning with brighter yellow or cream markings against darker backgrounds.

Inhabits tropical deciduous forests, thorn scrub, rocky arroyos, and scrubby woodland habitats in Mexico and southern Central America, often found near canyon bottoms, washes, and areas with dense vegetation. Primarily nocturnal and terrestrial, spending much time in burrows and under rocks during the day. Diet consists primarily of reptile eggs, nestling birds, small mammals, and other small vertebrates, which are subdued via envenomation through grooved teeth in the lower jaw.