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Snakes are elongated, legless, carnivorous reptiles of the suborder Serpentes<ref>{{#invoke:Citation/CS1|citation |CitationClass=journal }}</ref> that can be distinguished from legless lizards by their lack of eyelids and external ears. Like all squamates, snakes are ectothermic, amniote vertebrates covered in overlapping scales. Many species of snakes have skulls with several more joints than their lizard ancestors, enabling them to swallow prey much larger than their heads with their highly mobile jaws. To accommodate their narrow bodies, snakes' paired organs (such as kidneys) appear one in front of the other instead of side by side, and most have only one functional lung. Some species retain a pelvic girdle with a pair of vestigial claws on either side of the cloaca.

Living snakes are found on every continent except Antarctica, and on most smaller land masses — exceptions include some large islands, such as Ireland and New Zealand, and many small islands of the Atlantic and central Pacific.<ref name=Bauchot>{{#invoke:citation/CS1|citation |CitationClass=book }}</ref> Additionally, sea snakes are widespread throughout the Indian and Pacific Oceans. More than 20 families are currently recognized, comprising about 500 genera and about 3,400 species.<ref name="ITIS">{{#invoke:citation/CS1|citation |CitationClass=web }}</ref><ref name="NRDB-Cs">snake species list at the Reptile Database. Accessed 22 May 2012.</ref> They range in size from the tiny, 10 cm-long thread snake to the reticulated python of up to {{safesubst:#invoke:convert|convert}} in length.<ref name="SunBear">{{#invoke:Citation/CS1|citation |CitationClass=journal }}</ref> The fossil species Titanoboa cerrejonensis was {{safesubst:#invoke:convert|convert}} long.<ref name="head"/> Snakes are thought to have evolved from either burrowing or aquatic lizards, perhaps during the Jurassic period, with the earliest known fossils dating to between 143 and 167 Ma ago.<ref>{{#invoke:citation/CS1|citation |CitationClass=web

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{{#invoke:Citation/CS1|citation |CitationClass=journal }}</ref> The diversity of modern snakes appeared during the Paleocene period (c 66 to 56 Ma ago). The oldest preserved descriptions of snakes can be found in the Brooklyn Papyrus. Most species are nonvenomous and those that have venom use it primarily to kill and subdue prey rather than for self-defense. Some possess venom potent enough to cause painful injury or death to humans. Nonvenomous snakes either swallow prey alive or kill by constriction.
Snake sections
Intro  Etymology  Evolution   Distribution   Taxonomy  Biology  Behavior  Interactions with humans  See also  References  Further reading  External links  

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