Mexican beaded lizard 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 bands. As it is a specialized predator that feeds primarily upon eggs, the primary use of its venom is still a source of
Northern alligator lizard coast and can be found from sea level up to elevation of about . It is found in a variety of forested habitats and montane chaparral. Northern alligator lizard The northern alligator lizard ("Elgaria coerulea") is a medium-sized lizard that occurs on the North American west coast. The northern alligator lizard was formerly known by the scientific name of "Gerrhonotus coeruleus" , but is nowadays assigned to the genus "Elgaria". Four subspecies are recognized as being valid, including the nominotypical subspecies: "Nota bene": A trinomial authority in parentheses indicates that the subspecies was originally described in a genus other than