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.100 Women Britannica celebrates the centennial of the Nineteenth Amendment, highlighting suffragists and history-making politicians.COVID-19 Portal While this global health crisis continues to evolve, it can be useful to look to past pandemics to better understand how to respond today.Student Portal Britannica is the ultimate student resource for key school subjects like history, government, literature, and more.This Time in History In these videos, find out what happened this month (or any month!) in history.#WTFact Videos In #WTFact Britannica shares some of the most bizarre facts we can find.Demystified Videos In Demystified, Britannica has all the answers to your burning questions.Britannica Classics Check out these retro videos from Encyclopedia Britannica’s archives.Britannica Explains In these videos, Britannica explains a variety of topics and answers frequently asked questions.
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