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
Granite night lizard large eyes with vertical pupils, and they lack eyelids. Granite night lizards are often found on rocky slopes with large exfoliating boulders and abundant crevices, but are occasionally found in coastal sage scrub and chaparral without boulders. They are active in crevices during the day, but move on the surface at night. Granite night lizard The granite night lizard ("Xantusia henshawi" ) is a species of xantusiid lizard endemic to North America. The specific name, "henshawi", is in honor of American naturalist Henry Wetherbee Henshaw. "X. henshawi" is found in Mexico in the Mexican state of Baja California, and also