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
Side-blotched lizard are now usually considered subspecies of "U. stansburiana". "U. encantadae", "U. lowei", and "U. tumidarostra" might be subspecies of a distinct species (Las Encantadas side-blotched lizard), instead. Similarly, "U. auriculata" and "U. clarionensis" might be subspecies of a single species, the Revillagigedo side-blotched lizard. Side-blotched lizard Side-blotched lizards are lizards of the genus Uta. They are some of the most abundant and commonly observed lizards in the deserts of western North America. Their cycle among three colorized breeding patterns has achieved notoriety and is best described in the common side-blotched lizard. They commonly grow to six inches including the tail,