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
Viviparous lizard Viviparous lizard The viviparous lizard or common lizard, Zootoca vivipara (formerly "Lacerta vivipara"), is a Eurasian lizard. It lives farther north than any other species of non-marine reptile, and most populations are viviparous (giving birth to live young), rather than laying eggs as most other lizards do. It is the only species in the monotypic genus Zootoca. Both ""Zootoca"" and ""vivipara"" mean "live birth," in Greek and Latin respectively. It was called "Lacerta vivipara" until the genus "Lacerta" was split into nine genera in 2007 by , Arribas & Carranza. "Zootoca vivipara" can be seen in a variety of different