Saw Scaled Viper are arguably the most venomous

Vipers are found throughout most of the world, but arguably the most venomous is the Saw Scaled Viper and the Chain Viper, found primarily in the Middle East and Central Asia, particularly India, China and South East Asia. Vipers are quick tempered and generally nocturnal, often active after rains.
 They are also very fast. Most of these species have venom that cause symptoms that begin with pain at the site of the bite, immediately followed by swelling of the affected extremity. Bleeding is a common symptom, especially from the gums.
 There is a drop in blood pressure and the heart rate falls. Blistering occurs at the site of the bite, developing along the affected limb in severe cases.
 Necrosis is usually superficial and limited to the muscles near the bite, but may be severe in extreme cases.
 Vomiting and facial swelling occurs in about one-third of all cases. Severe pain may last for 2-4 weeks. Often, local swelling peaks within 48-72 hours, involving the affected limb.

 Discoloration may occur throughout the swollen area as red blood cells and plasma leak into muscle tissue. Death from septicaemia, respiratory or cardiac failure may occur 1 to 14 days post-bite, or even later.

Death Adder is found in Australia and New Guinea

The appropriately named Death Adder is found in Australia and New Guinea. They actually hunt and kill other snakes, including some on this list, usually via ambush. Death Adders look quite similar to vipers, in that they have triangular shaped heads and short, squat bodies.

They typically inject around 40-100mg of venom with an LD of 0.4mg-0.5mg/kg. An untreated Death Adder bite is one of the most dangerous in the world. The venom is a neurotoxin.

 A bite causes paralysis and can cause death within 6 hours, due to respiratory failure. Symptoms generally peak within 24-48 hours.

Antivenin is very successful in treating a bite from a Death Adder, particularly due to the relatively slow progression of symptoms, but before its development, a Death Adder bite had a fatality rate of 50%. With the quickest strike in the world, a Death Adder can go from strike position to striking and back again within 0.13 of a second.

Rattlesnake That is considered the most venomous species

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The only snake from the Americas on the list, the Rattlesnake is easily identifiable by the tell tale rattle on the end of its tail. They are actually a part of the Pit Viper family, and are capable of striking at up to 2/3rd their body length.
According to listverse .

 The Eastern Diamondback in considered the most venomous species in North America. Surprisingly, juveniles are considered more dangerous than adults, due to their inability to control the amount of venom injected.

 Most species of rattlesnakes have hemotoxic venom, destroying tissue, degenerating organs and causing coagulopathy (disrupted blood clotting). Some degree of permanent scarring is very likely in the event of a venomous bite, even with prompt, effective treatment, and can lead to the loss of a limb or death.

 Difficulty breathing, paralysis, drooling and massive hemorrhaging are also common symptoms. Thus, a rattlesnake bite is always a potentially fatal injury. Untreated rattlesnake bites, especially from larger species, are very often fatal. However, antivenin, when applied in time, reduces the death rate to less than 4%

The most Dangerous Snake in Indian

The Indian cobra is probably the most famous of India’s venomous snakes. It is embedded in Indian mythology and culture and is recognized as a powerful Hindu deity. It is also the creature of choice for India’s brazen snake charmers.

 The Indian cobra is one of a collection of snakes known as the ‘Big Four’ (the others include the common krait, Russell’s viper and the saw-scaled viper). These slippery customers are responsible for the highest number of snakebites in the country.

 So what happens if you are unfortunate enough to be bitten by one of these highly venomous cobras? Well, the post-synaptic neurotoxin will begin to paralyze your muscles and if you’re really unlucky, it’ll lead to respiratory failure or cardiac arrest. The cobra’s venom can kill in less than an hour.

  If that hasn’t put you off, you’ll find these beautiful snakes in the jungles, plains, fields, urban cities and snake-charmer’s baskets (during the Nag Panchami festival) across India, Bangladesh, Sri Lanka and Pakistan.

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The longest Snake in the World

The 50ft monster was captured by a team of villagers, terrified about the threat it posed to their community, who jumped on it, tied it up and put it in a makeshift cage.
 The creature, which has been named Fragrant Flower, is now drawing big crowds to a primitive zoo at Curugsewu, on the main Indonesian island of Java.
  Although it is rare for humans to be eaten by pythons, two Indonesian children have been swallowed in recent times.
 And last week a Thai man almost died when a python wrapped itself around him and started eating him, arm first.
 Armed with 100 teeth, the python grabs victims in its mouth then uses its massive body to squeeze them to death. It swallows its prey whole, digesting an entire animal such as a dog or a sheep in one piece.
 Pythons more than 25ft long can open their jaws wider than a human's shoulders and therefore are able to eat a man whole.
 A local government official in Curugsewu said of the village's prize attraction: "It's a beautiful creature but very frightening.
  "You would not want to be caught up in a fight to the death with this one because the snake would definitely win."
 Reticulated pythons can make their homes in holes, caves or trees, usually in rainforests or bushland near streams and lakes.
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But they also lurk on the outskirts of villages where they have been known to hunt chickens, cats, pigs and dogs and even bigger prey such as monkeys and deer.
 Fragrant Flower is being fed on stray dogs which are killed before they are put in its cage. It gets through three or four a month.
 The reticulated python gets its name from the criss-cross pattern of its scales, the word reticulate meaning a network of lines.
 Zoologists say they are intelligent but unpredictable creatures.
 They can be very placid and then suddenly strike with a devastating bite that can sever arteries and tendons.
 Its only rival in size is the South American anaconda, which is sometimes heavier but not longer.
  The previous heaviest snake recorded was a female anaconda, which was shot in Brazil in 1960 and weighed more than 35st.