− | There are 22 families of lizards, comprising approximately 3,800 species. About 20 species are commonly kept in captivity. The green iguana is the most popular. There are two poisonous species, the Gila monster and the Mexican beaded lizard, although you are unlikely to see them often in practice. | + | There are 22 families of lizards, comprising approximately 3,800 species. About 20 species are commonly kept in captivity. The green iguana is the most popular. There are two poisonous species, the Gila monster and the Mexican beaded lizard; their venom is not usually deadly but they can inflict extremely painful bites due to powerful jaws. However, it is unlikely to see them often in practice. |