Image:YoungCopperhead.jpgA snake charmer during a performance in Jaipur, India
Discover great deals on the many hard to find and one of a kind items available only on ebay!

Snake

Snakes 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. more...

HomeHome
AmphibianAmphibian
ArthropodArthropod
BirdBird
CatCat
DinosaurDinosaur
DogDog
FishFish
MammalMammal
MythologicalMythological
ReptileReptile
GeckoGecko
LizardLizard
SnakeSnake
TortoiseTortoise
TurtleTurtle


A love of snakes is called ophiophilia, a fear of snakes is called ophidiophobia (or snakephobia). A specialist in snakes is an ophiologist.

An old synonym for snake is serpent; 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.

Morphology further suggests that the likeliest ancestors were related to mosasaurs — extinct aquatic reptiles from the Cretaceous — which in turn are thought to have derived from varanid lizards. Under this hypothesis, the fused, transparent eyelids of snakes are thought to have evolved to combat marine conditions (corneal water loss through osmosis), while the external ears were lost through disuse in an aquatic environment, ultimately leading to an animal similar in appearance to sea snakes of today. In the Late Cretaceous, snakes re-colonized the land much as they are today. The best fossil snake remains are from Late Cretateous marine sediments, which supports this hypothesis. Similar skull structure; reduced/absent limbs; and other anatomical features found in both mosasaurs and snakes lead to a positive cladistical correlation, though some features are also shared with varanids. Supposedly similar locomotion for both groups is also used as support for this hypothesis.

An alternative hypothesis is that snakes directly evolved from burrowing lizards, either varanids or some other group. 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). As with the marine origin hypothesis, snakes re-emerged onto the surface of the land much as they are today. Fragmentary remains that have been found from the Early Cretaceous may refute either hypothesis. Further insight will no doubt also come from more detailed genetic studies.

The great diversity of modern snakes appeared in the Paleocene, probably correlated with the adaptive radiation of mammals following the extinction of the dinosaurs.

Feeding

All snakes are carnivorous, eating small animals including lizards and other snakes, rodents and other small mammals, birds, eggs or insects. Some snakes have a venomous bite which they use to kill their prey before eating it. Other snakes kill their prey by constriction resulting in death by strangulation. Still others swallow their prey whole and alive.

Snakes do not chew their food and have a very flexible lower jaw, the two halves of which are not rigidly attached, and numerous other joints in their skull (see snake skull), allowing them to open their mouths wide enough to swallow their prey whole, even if it is larger in diameter than the snake itself. Contrary to the popular myth, at no point do they "unhinge" their jaws (disarticulate their mandibular joints).

After eating, snakes become torpid while the process of digestion takes place. Digestion is an intensive activity, especially after the consumption of very large prey, and so much metabolic energy is involved that Crotalus durissus, the Mexican rattlesnake, may actually raise its body temperature as much as 6 degrees above the surrounding environment. Because of this, a snake disturbed after having eaten recently will often regurgitate the prey in order to be able to escape the perceived threat. However, when undisturbed, the digestive process is highly efficient, dissolving and absorbing everything but hair and claws, which are excreted along with uric acid waste. Snakes have been known to occasionally die from trying to swallow an animal that is too big.

Snakes do not normally prey on people, but there are instances of small children being eaten by large constrictors in the jungle. While some particularly aggressive species exist, most will not attack humans unless startled or injured, preferring instead to avoid contact. In fact, most snakes are non-venomous or have venom that is not harmful to humans.

Skin

The skin is covered in scales. Most snakes use specialized belly scales to move, gripping surfaces. The body scales may be smooth, keeled, or granular. Their eyelids are transparent "spectacle" scales which remain permanently closed. They shed their skin periodically. Unlike other reptiles, this is done in one piece, like pulling off a sock. It is thought that the primary purpose of this is to remove external parasites. This periodic renewal has led to the snake being a symbol of healing and medicine, as pictured in the Rod of Asclepius. In "advanced" (Caenophidian) snakes, the broad belly scales and rows of dorsal scales correspond to the vertebrae, allowing scientists to count the vertebrae without dissection. If there is not enough humidity in the air while snakes are shedding their skin, it can be very dangerous for the snake, because the dry skin does not shed. Skin that remains attached to the snake can harbour diseases and parasites. A tail tip that is not removed can constrict as the snake grows, cutting off the blood supply to the end of the tail causing it to drop off. A retained spectacle can cause the snake to become blind in the affected eye.

Perception

While snake vision is unremarkable (generally being best in arboreal species and worst in burrowing species), it is able to detect movement. Some snakes, like the Asian vine snake, have binocular vision. In most snakes, the lens moves back and forth within the eyeball to focus. In addition to their eyes, some snakes (pit vipers, pythons, and some boas) have infrared sensitive receptors in deep grooves between the nostril and eye which allow them to "see" the radiated heat. As snakes have no external ears, hearing is restricted to the sensing of vibrations, but this sense is extremely well developed. A snake smells by using its forked tongue to collect airborne particles then passing them to the Jacobson's organ in the mouth for examination. The fork in the tongue gives the snake a sort of directional sense of smell.

Read more at Wikipedia.org


[List your site here Free!]

Peugeot Ludix Snake (50cc)(4T)(10" Wheels) 2007 Smoked Front R/H Indicator LensPeugeot Ludix Snake (50cc)(4T)(10" Wheels) 2007 Smoked Front R/H Indicator Lens $9.50 Giuseppe Zanotti Design Antracite Rock Tallone Snake Thong Sandal Sz 36 170058JrGiuseppe Zanotti Design Antracite Rock Tallone Snake Thong Sandal Sz 36 170058Jr $129.00
Mike Mareen Don't Talk To The Snake / Powerplay Mix 12 Inch Vinyl Zyx Records NmMike Mareen Don't Talk To The Snake / Powerplay Mix 12 Inch Vinyl Zyx Records Nm $13.53 Nail Polish Tg183 on a silver Rhodium Plated Snake BraceletNail Polish Tg183 on a silver Rhodium Plated Snake Bracelet $14.94
Bueno Black Leather Purse Faux Alligator Snake Skin Patchwork Handbag 9x11X4Bueno Black Leather Purse Faux Alligator Snake Skin Patchwork Handbag 9x11X4 $21.24 Was: Previous Price $24.99 Sperry Top Sider Lace Up Snake Skin 9294406 Size 7 M Dock Boat Shoes Brown VgcSperry Top Sider Lace Up Snake Skin 9294406 Size 7 M Dock Boat Shoes Brown Vgc $15.99
Drain Sink Cleaner Bathroom Unclog Sink Tub Toilet Snake Brush Hair Removal VeDrain Sink Cleaner Bathroom Unclog Sink Tub Toilet Snake Brush Hair Removal Ve $4.96 Snake Tiger Crane Dvd NewSnake Tiger Crane Dvd New $15.36
Snake Hips - Runaway 7" Vinyl DemoSnake Hips - Runaway 7" Vinyl Demo $13.58 Snake Dictionary (An A To Z Of Amazing Snakes) By Clint Twist - Hardcover *New*Snake Dictionary (An A To Z Of Amazing Snakes) By Clint Twist - Hardcover *New* $35.95
Antique ! 18k Gold Rosecut Diamond ! Handmade ! Snake Necklace Jewelry !Antique ! 18k Gold Rosecut Diamond ! Handmade ! Snake Necklace Jewelry ! $1,499.00 Snake Skin Spinner Ring, 925 Sterling Silver, Rocker Style, Elegant, EverydaySnake Skin Spinner Ring, 925 Sterling Silver, Rocker Style, Elegant, Everyday $33.95
Snake Plissken Chronicles (2003) #1A Vg Low GradeSnake Plissken Chronicles (2003) #1A Vg Low Grade $2.45 Rigby Sails Sailing Solo : Leveled Reader Snakes That RattleRigby Sails Sailing Solo : Leveled Reader Snakes That Rattle $6.77
Kyara Eyewear Women's Oversized Plastic Round Shape Sunglasses Smoke Lens SnakeKyara Eyewear Women's Oversized Plastic Round Shape Sunglasses Smoke Lens Snake $20.00 Literacy Edition Storyworlds Stage 8, Animal World, The Snake By Not UsedgoodLiteracy Edition Storyworlds Stage 8, Animal World, The Snake By Not Usedgood $12.95
SnakeSnake $12.33 Micro Yamaguchi / Revol Mini rm-012 Metal Gear Solid V: Tpp Venom Snake FigureMicro Yamaguchi / Revol Mini rm-012 Metal Gear Solid V: Tpp Venom Snake Figure $53.39
Eastern Green Mamba Snake Nature Animals Print Canvas CaEastern Green Mamba Snake Nature Animals Print Canvas Ca $21.32 to $42.67 Tt 1.0mm 9K Rose Gold Filled Round Snake Chain Necklace (Cf150)Tt 1.0mm 9K Rose Gold Filled Round Snake Chain Necklace (Cf150) $8.00
Blue Snake Macro Nature Animals Print Canvas CaBlue Snake Macro Nature Animals Print Canvas Ca $21.32 to $42.67 Cam Jansen And The Scary Snake Mystery By David A. Adler - Hardcover *Brand New*Cam Jansen And The Scary Snake Mystery By David A. Adler - Hardcover *Brand New* $12.95
Unique ! 18k Gold Rosecut Diamond ! Polki ! Snake Necklace Jewelry !Unique ! 18k Gold Rosecut Diamond ! Polki ! Snake Necklace Jewelry ! $1,699.00 79741 1-pack #6 spanner security isomax 9-inch screwdriver (fits snake eye79741 1-pack #6 spanner security isomax 9-inch screwdriver (fits snake eye $21.49
Animal World-Disney`s Animal World: Snakes and Frogs and Toadssnakes,fro Dvd NewAnimal World-Disney`s Animal World: Snakes and Frogs and Toadssnakes,fro Dvd New $20.67 Slithering Snake Cuff Alloy Bangle Bracelet Fashion Jewelry Costume Accessory WvSlithering Snake Cuff Alloy Bangle Bracelet Fashion Jewelry Costume Accessory Wv $6.27
Snake Fist Dynamo Dvd NewSnake Fist Dynamo Dvd New $15.36 Nwt Dvf Tilda Black Snake Embossed Leather Belt Sz Xs 170266 ENwt Dvf Tilda Black Snake Embossed Leather Belt Sz Xs 170266 E $49.98
Adjustable Silver Plate Snake Bracelet Chain Fits European charmsAdjustable Silver Plate Snake Bracelet Chain Fits European charms $11.99 Metal Gear Solid Snake Rain Art Print Canvas CaMetal Gear Solid Snake Rain Art Print Canvas Ca $21.32 to $42.67
Karen Millen Purple Green Snake Print Halterneck Mock Wrap Dress Uk 8 Xs FlareKaren Millen Purple Green Snake Print Halterneck Mock Wrap Dress Uk 8 Xs Flare $101.89 4.32 ct Diamond Pave Snake 925 Sterling Silver Vintage Style Ring Fine Jewelry4.32 ct Diamond Pave Snake 925 Sterling Silver Vintage Style Ring Fine Jewelry $399.00
Nwt Coach F50065 Taylor Snake Print Swingpack Cross body Bag AuthenticNwt Coach F50065 Taylor Snake Print Swingpack Cross body Bag Authentic $82.99 Textured Skin Wrap Sticker For Lg G4 & G4C Carbon Decal Case Matt Metal LeatherTextured Skin Wrap Sticker For Lg G4 & G4C Carbon Decal Case Matt Metal Leather $6.78
Snake Elk Shed Deer Antler Carving Pendant with 925 Silver Bale 60103268Snake Elk Shed Deer Antler Carving Pendant with 925 Silver Bale 60103268 $19.99 Pandora Sterling Silver Coiled Snake CharmPandora Sterling Silver Coiled Snake Charm $20.00
Calamity Of Snakes Dvd NewCalamity Of Snakes Dvd New $13.17 Trigrams Tai-chi Tortoise snake Sable serpent Sword pattern steel blade #0052Trigrams Tai-chi Tortoise snake Sable serpent Sword pattern steel blade #0052 $487.00
Ireland Mnh 2001 Greeting Stamps - Chinese New Year - Year of the SnakeIreland Mnh 2001 Greeting Stamps - Chinese New Year - Year of the Snake $2.72 Green Mini Faux Snake skin Evening Party Dress Sz SGreen Mini Faux Snake skin Evening Party Dress Sz S $5.24 Was: Previous Price $6.99
Turtle Necklace Pendant Charm Snake Chain Sea Life Beach Surfer Silver JewelryTurtle Necklace Pendant Charm Snake Chain Sea Life Beach Surfer Silver Jewelry $9.99 Peugeot Ludix Snake (50cc) (4T) (10" Wheels) 2007 Smoked Rear L/H Indicator LensPeugeot Ludix Snake (50cc) (4T) (10" Wheels) 2007 Smoked Rear L/H Indicator Lens $9.50
H&M Size M Grey Snake Print Summer Beach KimonoH&M Size M Grey Snake Print Summer Beach Kimono $13.58 Play Time Game 3d Snakes And Ladders Board Game - Toy ChildrenPlay Time Game 3d Snakes And Ladders Board Game - Toy Children $8.53 List price: Previous Price $16.13
Super Snake Dvd NewSuper Snake Dvd New $21.97 Leather 8"x10" Brick Rust Tropical Python Multicolored Snake embossed CowhideLeather 8"x10" Brick Rust Tropical Python Multicolored Snake embossed Cowhide $6.99
Snake People Dvd NewSnake People Dvd New $13.17
Click to see more Snake items at www.ebay.com
Prices current as of last update, 09/17/17 3:40am.

Home Contact Resources Exchange Links eBay