Snake from Wikipedia, the Free Encyclopedia This Article Is About the Animal. for Other Uses, See Snake (Disambiguation). Page S
Snake From Wikipedia, the free encyclopedia This article is about the animal. For other uses, see Snake (disambiguation). Page semi-protected Snakes Temporal range: Early Cretaceous – Holocene, 112–0Ma PreЄ Є O S D C P T J K Pg N Coast Garter Snake.jpg Thamnophis elegans, a species from western North America Scientific classification e Kingdom: Animalia Phylum: Chordata Class: Reptilia Order: Squamata Clade: Ophidia Suborder: Serpentes Linnaeus, 1758 Infraorders Alethinophidia Nopcsa, 1923 Scolecophidia Cope, 1864 World distribution of snakes.svg Approximate world distribution of snakes, all species Snakes are elongated, legless, carnivorous reptiles of the suborder Serpentes 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, in the Pacific and Indian Oceans, 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.[1] More than 20 families are currently recognized, comprising about 500 genera and about 3,400 species.[2][3] They range in size from the tiny, 10 cm-long thread snake to the Reticulated python of up to 8.7 meters (29 ft) in length.[4][5] The fossil species Titanoboa cerrejonensis was 15 meters (49 ft) long.
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