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!]

Shinning Rope Twisted Snake Shape Silver-plated Bracelet Hand Chain Gift LiiShinning Rope Twisted Snake Shape Silver-plated Bracelet Hand Chain Gift Lii $0.99 New Flexible 3 Led Usb Snake Light Lamp for Notebook Pc Laptop Tablet HcxmNew Flexible 3 Led Usb Snake Light Lamp for Notebook Pc Laptop Tablet Hcxm $1.70
Guinea Bissau 2010 Hindu Hindusim Tiger Cow Dog Snake Monkey Ms+S/S 706Guinea Bissau 2010 Hindu Hindusim Tiger Cow Dog Snake Monkey Ms+S/S 706 $19.50 Les Copains Jacket Blazer Unlined Python Beige Snake S 34 36Les Copains Jacket Blazer Unlined Python Beige Snake S 34 36 $250.00
Sao Tome 2016 Reptiles Snake Lizard Chameleon Ms+S/S St16306Sao Tome 2016 Reptiles Snake Lizard Chameleon Ms+S/S St16306 $18.20 White Snake Skin Python Stylish Hard Cover Case For Samsung Galaxy S6 Gs6White Snake Skin Python Stylish Hard Cover Case For Samsung Galaxy S6 Gs6 $4.95
New Set of 12 Rubber 36" Coiled Rubber Prop Toy SnakesNew Set of 12 Rubber 36" Coiled Rubber Prop Toy Snakes $15.80 Snake Handler T-Shirt - reptile & snake handlers skull logo tee shirt - Black XlSnake Handler T-Shirt - reptile & snake handlers skull logo tee shirt - Black Xl $17.95
Diamond snake wound bandage around sexy sandalsDiamond snake wound bandage around sexy sandals $17.99 to $19.99 Cole Haan Women's Amelia Grand 45mm Dress Pump - Choose Sz/ColorCole Haan Women's Amelia Grand 45mm Dress Pump - Choose Sz/Color $105.80 to $322.42
Nwt $200 Just Cavalli Underwear Brown Snake Print T-Shirt Blouse Top It44/Us10Nwt $200 Just Cavalli Underwear Brown Snake Print T-Shirt Blouse Top It44/Us10 $49.50 Was: Previous Price $99.00 Castle Wang Snake Oil Reduce Pain Muscle Aches Massage Popular in Chinese BestCastle Wang Snake Oil Reduce Pain Muscle Aches Massage Popular in Chinese Best $22.90 to $95.00
G.I. Joe The Rise of Cobra 3 3/4" Movie Action Figure- Snake Eyes Paris Pursu.G.I. Joe The Rise of Cobra 3 3/4" Movie Action Figure- Snake Eyes Paris Pursu. $47.93 Fun Central (Az988) 22 Inch Green Garden Rubber Snakes - 12ctFun Central (Az988) 22 Inch Green Garden Rubber Snakes - 12ct $14.74
Finely Chinese Qing Dy Old Nephrite Jade Carved Snake On turtle Design "Bai JianFinely Chinese Qing Dy Old Nephrite Jade Carved Snake On turtle Design "Bai Jian $1,000.00 Plush Soft Building Block - Animal and Zodiac - SnakePlush Soft Building Block - Animal and Zodiac - Snake $24.95
Cole Haan Women's Studiogrand Ballet Flat - Choose Sz/ColorCole Haan Women's Studiogrand Ballet Flat - Choose Sz/Color $148.88 to $417.12 Snake Shaped Drain Sink Cleaner Removes Clogged Hairs For Bathroom Kitchen VfSnake Shaped Drain Sink Cleaner Removes Clogged Hairs For Bathroom Kitchen Vf $0.99
Beautiful cinnabar carved Chinese zodiac pendant bead 38x30x10mm Zs1010Beautiful cinnabar carved Chinese zodiac pendant bead 38x30x10mm Zs1010 $4.99 to $15.99 Auth Platinum 900 Snake Motif 0.07ct 1P Diamond Ring #16 (Japanese Size) Dh42511Auth Platinum 900 Snake Motif 0.07ct 1P Diamond Ring #16 (Japanese Size) Dh42511 $635.00
Embroidered Sew Iron On Patch Badge Butterfly Snake Flower Clothes Applique DiyEmbroidered Sew Iron On Patch Badge Butterfly Snake Flower Clothes Applique Diy $0.99 to $1.45 5Pcs Silver Gold Plated Snake Chain Link Clasp Jewelry Findings Necklace Diy Hot5Pcs Silver Gold Plated Snake Chain Link Clasp Jewelry Findings Necklace Diy Hot $1.71
Catchmaster 60m Bulk Packed Mouse Insect and Snake Glue Boards, 60-PackCatchmaster 60m Bulk Packed Mouse Insect and Snake Glue Boards, 60-Pack $31.20 1964 Press Photo Grand Canyon, Snake river, boundary between Oregon and Idaho1964 Press Photo Grand Canyon, Snake river, boundary between Oregon and Idaho $13.88
New Womens Black Grey Snake Print Shearing Bandeau Tunic Top Plus Size 16-20New Womens Black Grey Snake Print Shearing Bandeau Tunic Top Plus Size 16-20 $18.50 Chinese brass fengshui zodiac Snake Monkey wealth yuanbao money Lucky Art statueChinese brass fengshui zodiac Snake Monkey wealth yuanbao money Lucky Art statue $65.00
The Snake Charmer: A Novel-ExLibraryThe Snake Charmer: A Novel-ExLibrary $3.99 Style & Co Sc288 2 For 1 Skinny Belts Beige Cream, Python Snake Print Xl #677Style & Co Sc288 2 For 1 Skinny Belts Beige Cream, Python Snake Print Xl #677 $10.50
[Malie] 5 * sheets Ultra Hydrating Essence Facial Mask / Buy 2 Get 2 Pics Free[Malie] 5 * sheets Ultra Hydrating Essence Facial Mask / Buy 2 Get 2 Pics Free $5.49 Coffee Tea Mug Tibetan Astrology Snake Year Horoscope Sign Ceramic CollectibleCoffee Tea Mug Tibetan Astrology Snake Year Horoscope Sign Ceramic Collectible $15.83
For Meizu Meilan U20 5.5" Charming Snake Pu Leather Stand Case Cover Flip HolderFor Meizu Meilan U20 5.5" Charming Snake Pu Leather Stand Case Cover Flip Holder $3.98 to $6.31 Was: Previous Price $6.18 Pretty 18k Yellow Italy Gold Polished Snake Chain Necklace 18-26 inches abcaPretty 18k Yellow Italy Gold Polished Snake Chain Necklace 18-26 inches abca $1.33 to $1.41
Mango (Zara Group) Brown (Chocolate) Snake Flat Sandals Size Us 7.5/Uk5/Eu 38Mango (Zara Group) Brown (Chocolate) Snake Flat Sandals Size Us 7.5/Uk5/Eu 38 $23.00 Gorgeous ! "Carlos Santana" Gold Snake Print High Heels Open Toes Shoes Sz 6.5MGorgeous ! "Carlos Santana" Gold Snake Print High Heels Open Toes Shoes Sz 6.5M $14.99
Head Case Designs Zodiac Animal Hard Back Case For Samsung Tablets 1Head Case Designs Zodiac Animal Hard Back Case For Samsung Tablets 1 $12.95 to $15.85 List price: Previous Price $25.90 Toxicology and pharmacology of venoms from poisonous snakes,-ExLibraryToxicology and pharmacology of venoms from poisonous snakes,-ExLibrary $16.19
Electric Pipeline Pipe Sink Tub Drain Unclogger Wet Snake Vacuum Cleaner MachineElectric Pipeline Pipe Sink Tub Drain Unclogger Wet Snake Vacuum Cleaner Machine $166.87 Monoprice 8767 20 ft 4-Channel Balanced Xlr Male to Xlr Female Snake CableMonoprice 8767 20 ft 4-Channel Balanced Xlr Male to Xlr Female Snake Cable $22.94
Womens 5Pcs Silver Plated Purple Enamel Beads European Fit Snake Chain BraceletWomens 5Pcs Silver Plated Purple Enamel Beads European Fit Snake Chain Bracelet $1.78 Auto Chrome 3D Snake Cobra Red Led Eye Light Manual Gear Shifter Lever KnobAuto Chrome 3D Snake Cobra Red Led Eye Light Manual Gear Shifter Lever Knob $11.10 Was: Previous Price $11.68
Boka Vipera Snake Brass Biker Key Chain Hook Harley Motorcycle Bike Men Gold FobBoka Vipera Snake Brass Biker Key Chain Hook Harley Motorcycle Bike Men Gold Fob $39.00
Click to see more Snake items at www.ebay.com
Prices current as of last update, 07/23/17 1:40am.

Home Contact Resources Exchange Links eBay