Nine classes of toxin known from snakes are produced by lizards. Evolution of snake venom Until it was thought that among lizards, only the Gila monster and the Mexican beaded lizard were venomous. Some lizards such as chameleons have prehensile tails, assisting them in climbing among vegetation. Lizards exploit a variety of different camouflage methods. This helps them detect predators stalking it from above. Mammalian prey typically consists of rodents and leporids ; the Komodo dragon can kill prey as large as water buffalo.
Some groups, particularly geckos, snake-lizards, and some iguanids, can produce more complex sounds and vocal apparatuses have independently evolved in different groups. Lizards and snakes share a movable quadrate bone , distinguishing them from the sphenodonts , which have more primitive and solid diapsid skulls. They rely on persistence and ambush to capture these prey. A captive female Komodo dragon produced a clutch of eggs, despite being separated from males for over two years. It had been thought on the basis of morphological data that iguanid lizards diverged from other squamates very early on, but molecular evidence contradicts this. Lizards partially regenerate their tails over a period of weeks. 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. Plant parts can be hard to digest and as they get closer to adulthood, juvenile iguanas eat faeces from adults to acquire the microflora necessary for their transition to a plant-based diet. Aside from legless lizards , most lizards are quadrupedal and move using gaits with alternating movement of the right and left limbs with substantial body bending. Several small species such as those in the genus Draco can glide: Hissing , a typical reptilian sound, is mostly produced by larger species as part of a threat display, accompanying gaping jaws. The mating call of the male tokay gecko is heard as "tokay-tokay! Some lizards such as chameleons have prehensile tails, assisting them in climbing among vegetation. The skin is tough and leathery, and is shed sloughed as the animal grows. They tend to show brighter colours when displaying aggression  and darker colours when they submit or "give up". If caught, some species such as the greater short-horned lizard puff themselves up, making their bodies hard for a narrow-mouthed predator like a whip snake to swallow. In most lizards, the eggs have leathery shells to allow for the exchange of water, although more arid-living species have calcified shells to retain water. Camouflage The flat-tail horned lizard 's body is flattened and fringed to minimise its shadow. Mammalian prey typically consists of rodents and leporids ; the Komodo dragon can kill prey as large as water buffalo. Many species are tree-dwelling Distribution and habitat Lizards are found worldwide, excluding the far north and Antarctica, and some islands. The female prairie skink uses respiratory water loss to maintain the humidity of the eggs which facilitates embryonic development. This suggests that these genes evolved in the common ancestor of lizards and snakes , some million years ago forming a single clade , the Toxicofera. While it is usually males that display, in some species females also use such communication. Brooding and protection of eggs does occur in some species. This is known in occur in various species of whiptail lizards.
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