The Gila monster (Heloderma suspectrum) averages 9- to 14 inches long, but can get up to 24 inches long. It ranges throughout the Sonoran Desert region below about 4,000 feet elevation. Its range included parts of Arizona, California, Nevada, New Mexico and northern Sinaloa, Mexico.
It feeds on eggs of reptiles and birds, and takes small rodents, such as pack rats, and baby mammals such as rabbits and squirrels. Mating occurs in spring or early summer. Observations in the wild suggest an incubation period of 10 months, but captive lizards produce hatchlings in about 4 months. There are two subspecies of Gila monster: the reticulate Gila monster (H. suspectum suspectum) and the banded Gila monster (H. suspectum cinctum). The reticulate Gila monster lives in the southern region part of the range, while the banded Gila monster occurs primarily in the Mojave Desert. The reticulate Gila monster tends to have its lighter markings broken up by dark scales, giving it a reticulated pattern, while the banded Gila monster generally has more unbroken bands of lighter scales.
The Mexican beaded lizard (Heloderma horridum) averages 2- to 3 feet long. It ranges throughout southern Sonora. It feeds on birds, small mammals, other lizards, and eggs. It can climb trees. Little is know about mating in the wild. Captive lizards mate in August, produce eggs in October which hatch from January to March.
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