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However, it spends much of its time basking on lava rocks on the islands. One living lizard, the marine iguana ( Amblyrhynchus cristatus) of the Galapagos Islands, feeds on algae in the sea.

Some mosasaurs were giants and grew to lengths of 10 metres (33 feet). Lizards of the family Mosasauridae, an extinct group, were strictly marine. Some move slowly and rely on cryptic coloration for protection, whereas others can run swiftly across desert sands. Lizards occupy diverse habitats that range from underground warrens and burrows to the surface and elevated vegetation. Male lizards may be outfitted with a wide array of ornamentation-such as extensible throat fans and frills, throat spines, horns or casques on the head, and tail crests. Representatives of several families are limbless and resemble snakes, whereas others have long hind legs that permit bipedal locomotion. The popular conception of a lizard as a scampering reptile about 30 cm (12 inches) in total length with a slender tail may be applied accurately only to a small number of species. The weight of adult lizards ranges from less than 0.5 gram (0.02 ounce) to more than 150 kg (330 pounds). They range from 2 cm (0.8 inch) snout to vent in geckos (family Gekkonidae) to 3 metres (10 feet) in total length in monitor lizards (family Varanidae). Lizards are by far the most diverse group of modern reptiles in body shape and size. Study how marine iguanas live on the coasts of the Galapagos Islands and survive on seaweeds See all videos for this article
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For a full description of snakes, see snake. In addition to those traits they have in common with non-snake lizards, snakes are often separated from other lizards in popular literature because they share a set of unique traits that are relatively easy to observe. Snakes arose from lizards and are thus considered to be a highly specialized group of limbless lizards. Most of the living species of lizards inhabit warm regions, but some are found near the Arctic Circle in Eurasia and others range to the southern tip of South America. External ear openings have disappeared in some species in the genera Holbrookia and Cophosaurus. Movable eyelids have been lost in some geckos, skinks, and night lizards. For example, limb degeneration and loss has occurred in glass lizards ( Ophisaurus) and other lizard groups. However, some traditional (that is, non-snake) lizards lack one or more of these features. Lizards are scaly-skinned reptiles that are usually distinguished from snakes by the possession of legs, movable eyelids, and external ear openings. Lizard, (suborder Sauria), any of more than 5,500 species of reptiles belonging in the order Squamata (which also includes snakes, suborder Serpentes). SpaceNext50 Britannica presents SpaceNext50, From the race to the Moon to space stewardship, we explore a wide range of subjects that feed our curiosity about space!.Learn about the major environmental problems facing our planet and what can be done about them! Saving Earth Britannica Presents Earth’s To-Do List for the 21st Century.Britannica Beyond We’ve created a new place where questions are at the center of learning.100 Women Britannica celebrates the centennial of the Nineteenth Amendment, highlighting suffragists and history-making politicians.
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