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
Western green lizard Western green lizard The western green lizard (Lacerta bilineata) is a wall lizard of the Lacertidae family. The genus name "Lacerta" and the species name "bilineata" are Latin words respectively meaning “lizard” and “with two lines”, with reference to the pale lines present on the flanks of the young individuals. It is found in Andorra, Croatia, France, Germany, Italy, Monaco, Serbia, Slovenia, Spain, Switzerland, on Jersey in the British Isles, and the United States. There are also colonies on the south coast of the U.K, notably around Poole Bay in Dorset. "Lacerta bilineata" reaches an average length (excluding tail) of