Mexican beaded lizard debate among scientists. However, this venom has been found to contain several enzymes useful for manufacturing drugs in the treatment of diabetes, and research on the pharmacological use of its venom is ongoing. Threatened throughout its range by overcollection and habitat loss, it is a CITES protected species. The Guatemalan beaded lizard ("H. charlesbogerti" ) is one of the rarest lizards in the world, with a wild population of fewer than 200. The beaded lizards have one close living relative, the Gila monster ("H. suspectum"), as well as many extinct relatives in the Helodermatidae, whose genetic history may be traced
Common collared lizard Common collared lizard The common collared lizard ("Crotaphytus collaris"), also called eastern collared lizard, Oklahoma collared lizard or collared lizard, is a North American lizard that can reach in length (including the tail), with a large head and powerful jaws. They are well known for the ability to run on their hind legs, looking like small versions of the popular images of theropod dinosaurs. Chiefly found in dry, open regions of Mexico and the south-central United States including Missouri, Texas, Arizona, and Kansas, the full extent of its habitat in the United States ranges from the Ozark Mountains to southern