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
Slender glass lizard Slender glass lizard The slender glass lizard ("Ophisaurus attenuatus") is a legless lizard in the family Anguidae. The species is endemic to the United States. Two subspecies are recognised. Slender glass lizards have yellow to brown bodies with six stripes, and they have two lateral grooves (one on each side). Unlike snakes, they have eyelids and ears. "O. attenuatus" can attain a total length (including tail) of up to 1 meter (about 40 inches). "O. attenuatus" is found in the United States, from as far north as Wisconsin, east to Virginia, south to Florida, and west to Texas, in grasslands