Heloderma suspectum cinctum

Gila Monster Banded

Family: Helodermatidae · Class: Reptilia · Order: Squamata

Conservation status: G4T3 S1

The banded gila monster is a large, heavy-bodied lizard and one of only two venomous lizard species in North America. Adults typically measure 35 to 56 centimeters (14 to 22 inches) in total length and can weigh up to 2.3 kilograms (5 pounds). The species is distinguished by its distinctive banded pattern of alternating black and pink, orange, or yellow crossbands across the body and tail. The skin is covered in small, bead-like scales called osteoderms, giving it a beaded appearance. The head is large and triangular with a broad, rounded snout and powerful jaws equipped with grooved teeth for delivering venom. Historically, the banded gila monster occurred throughout much of the Sonoran Desert region of southwestern North America. In California, this subspecies is found primarily in the southeastern desert regions, including portions of Imperial, Riverside, and San Bernardino counties. The species' range extends into Arizona, Nevada, and northwestern Mexico. Current populations in California are limited to scattered locations within suitable habitat, representing the western edge of the species' distribution. Banded gila monsters inhabit desert scrubland, semi-arid grasslands, and oak woodland environments at elevations typically below 1,500 meters (4,900 feet). They prefer areas with rocky outcrops, arroyos, and washes that provide shelter and prey opportunities. The species requires access to underground retreats such as burrows, rock crevices, or abandoned mammal dens where they spend approximately 95 percent of their time. Suitable habitat includes areas with sufficient prey density and adequate thermal refugia. This species is primarily active during cooler months from April through June and again in fall, emerging mainly during dawn and dusk hours. Banded gila monsters are opportunistic predators that feed primarily on eggs and nestlings of ground-nesting birds, small mammals, and reptiles. They possess an excellent sense of smell and can detect prey buried up to 15 centimeters underground. Mating occurs in late spring, with females laying 2 to 12 leathery eggs in sandy soil during summer months. The eggs incubate for 9 to 10 months, with young emerging the following spring measuring approximately 16 centimeters in length. The banded gila monster is classified as a Species of Concern by the U.S. Fish and Wildlife Service as of December 2025 (USFWS ECOS Database). While not federally listed as threatened or endangered, populations face ongoing pressures from habitat loss due to urban development, agriculture, and renewable energy projects. Collection for the pet trade, vehicle strikes, and human persecution also impact local populations. The species is protected under state regulations in California, Arizona, and Nevada, which prohibit collection, possession, or harassment without permits. Conservation efforts focus on habitat protection, public education, and monitoring of known populations to assess population trends and habitat quality.

Data from The California Species Project — 14,000+ California species with verified data from CNPS, CDFW, USFWS, and more.