Mexican beaded lizard beaded lizard under the Convention on International Trade in Endangered Species as an Appendix I animal, making it illegal to export the species. Mexican beaded lizard The Mexican beaded lizard ("Heloderma horridum") is a species of lizard in the family Helodermatidae, one of the two species of venomous beaded lizards found principally in Mexico and southern Guatemala. It and its congener (member of the same genus) the Gila monster ("Heloderma suspectum") are the only lizards known to have evolved an overt venom delivery system. The Mexican beaded lizard is larger than the Gila monster, with duller coloration, black with yellowish
Greater short-horned lizard widely distributed lizard in North America and occurs in the widest range of habitats: West into central Nevada, East into North and South Dakota, North to Southern Saskatchewan and Alberta and then South into the Texas Panhandle and into central Mexico. This species of lizard is mostly an arid mountain dweller living in the range of 9000–11,300 feet (170–3440 m). It is the only member of its genus in Wyoming, which counts "Phrynosoma" as its state reptile. It is also considered an endangered species in Saskatchewan and Alberta. The greater short-horned lizard occupies ranges from semiarid plains to high elevations