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Snakes (from Old English snaca, and ultimately from the Proto-Indo-European base snag- or sneg-, "to crawl"), also known as ophidians, are cold blooded legless reptiles closely related to lizards, which share the order Squamata. There are also several species of legless lizard which superficially resemble snakes, but are not otherwise related to them. A love of snakes is called ophiophilia, a fear of snakes is called ophidiophobia. A specialist in snakes is an ophiologist.

An old synonym for snake is serpent (which comes from Old French, and ultimately from *serp-, "to creep"); in modern usage this usually refers to a mythic or symbolic snake, and information about such creatures will be found under serpent (symbolism). This article deals with the biology of snakes.

Evolution


The phylogeny of snakes is poorly known due to the fact that snake skeletons are typically small and fragile, making fossilization unlikely. It has however been generally agreed, on the basis of morphology, that snakes descended from lizard-like ancestors. Recent research based on genetics and biochemistry confirms this; snakes form a venom clade with several extant lizard families.

Recent fossil evidence suggests that snakes directly evolved from burrowing lizards, either varanids or some other group. An early fossil snake, Najash rionegrina, was a two-legged burrowing animal with a sacrum, fully terrestrial. One extant analog of these putative ancestors is the earless monitor Lanthanotus of Borneo, although it also is semi-aquatic. As these ancestors became more subterranean, they lost their limbs and became more streamlined for burrowing. Features such as the transparent, fused eyelids and loss of external ears, according to this hypothesis, evolved to combat subterranean conditions (scratched corneas, dirt in the ears). According to this hypothesis, snakes re-emerged onto the surface of the land much as they are today. Other primitive snakes are known to have possessed hindlimbs but lacked a direct connection of the pelvic bones to the vertebrae, including Haasiophis, Pachyrhachis and Eupodophis) which are slightly older than Najash.

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Snakes :: Reptiles and Amphibians

 
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i hate sneaky snakes.
beachballz (Erin Lung) Fri, 08 Jan 2010 01:16:25 -0000
i hate sneaky snakes.
@doughboi133 @djels and @yungflykiddd all snakes lmao
Chubs89 (Juan Chubs&quo) Fri, 08 Jan 2010 01:11:00 -0000
@doughboi133 @djels and @yungflykiddd all snakes lmao
@janaeyvette when the grass is cut the snakes will show. | that's why i stay mowing the lawn.
TheKiidCam (Cameron V. Collins) Fri, 08 Jan 2010 01:09:28 -0000
@janaeyvette when the grass is cut the snakes will show. | that's why i stay mowing the lawn.
BEEN HIT A 3-60 AND I DID IT WITHOUT ANY1S SYMPATHY STANDING TALL THRU ALL THE TRICKERY THE SNAKES SLITHERING & BAIT THAT'S LINGERING
1SUGARSMACKS (THE RAWE$T ) Fri, 08 Jan 2010 01:09:02 -0000
BEEN HIT A 3-60 AND I DID IT WITHOUT ANY1S SYMPATHY STANDING TALL THRU ALL THE TRICKERY THE SNAKES SLITHERING & BAIT THAT'S LINGERING
RT @TheKiidCam: @janaeyvette I guess its the trait of a snake niggas and bitches!--when the grass is cut the snakes will show
janaeyvette (Janae' Varnado) Fri, 08 Jan 2010 01:05:34 -0000
RT @TheKiidCam: @janaeyvette I guess its the trait of a snake niggas and bitches!--when the grass is cut the snakes will show
@gryffindorgal87 yeah!!! Any guys who can cut off an evil snakes head is ok by me! (even if he did use Gryffindor's sword to do it XD)
NyssaM (D B) Fri, 08 Jan 2010 01:00:41 -0000
@gryffindorgal87 yeah!!! Any guys who can cut off an evil snakes head is ok by me! (even if he did use Gryffindor's sword to do it XD)

 
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