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Only two lizard species are venomous: the Mexican beaded lizard and the closely-related Gila monster, both of which live in northern Mexico and the southwest United States.
The chief impact of lizards on humans is positive; they are significant predators of pest species; numerous species are prominent in the pet trade; some are eaten as food (for example, iguanas in Central America); and lizard symbology plays important, though rarely predominant roles in some cultures (e.g.
Lizards in the Scincomorpha family, which include skinks (such as the blue-tailed skink), often have shiny, iridescent scales that appear moist.
Saurischia Saurischians (from the Greek Saurischia meaning "lizard hip") are one of the two orders/branches of dinosaurs.
Varanids, and a few other lizard species, employ buccal pumping as a complement to their normal "axial breathing." This allows the animals to completely fill their lungs during intense locomotion, and thus remain aerobically active for a long time.
Tegu lizards are known to possess a proto-diaphragm, which separates the pulmonary cavity from the visceral cavity.
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