Lizard heads called the parietal eye, a basal ("primitive") feature also present in the tuatara. This "eye" has only a rudimentary retina and lens and cannot form images, but is sensitive to changes in light and dark and can detect movement. This helps them detect predators stalking it from above. Until 2006 it was thought that among lizards, only the Gila monster and the Mexican beaded lizard were venomous. However, several species of monitor lizards, including the Komodo dragon, produce powerful venom in their oral glands. Lace monitor venom, for instance, causes swift loss of consciousness and extensive bleeding through its
Mosor rock lizard Mosor rock lizard The Mosor rock lizard ("Dinarolacerta mosorensis") is a species of lizard in the Lacertidae family. It is found in Bosnia and Herzegovina, Croatia, Serbia, and Montenegro. Its natural habitats are boreal forests, temperate forests, temperate shrubland, and rocky areas. It is threatened by habitat loss. The Mosor rock lizard is a flattened lizard with a long head and slender tail. It grows to a snout-to-vent length of about with a tail approximately twice as long. The dorsal surface is somewhat glossy and is brown, greyish-brown or olive-brown with darker mottling and speckling. The flanks are usually darker