Top 5 Most Venomous Snakes

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If you are a long time reader of Listverse, you will remember that we have previously had two lists on snakes: 10 lesser known venomous snakes and ten unusual and amazing snakes.

Surprisingly, we have not published a list of the most venomous snakes – and so, today, we fill that void with the following list.

This is probably also a good time to point out (which we have done on a previous record) that something is poisonous when it injects you with venom, and something is vicious when it harms you through touch or eating.

Top 1: Fierce Snake or Inland Taipan

While I did say that I would not include multiple sub-species in this list, the incredible Inland Taipan deserves a spot of its own.

It has the most toxic venom of any land snake in the world. The maximum yield recorded for one bite is 110mg, enough to kill about 100 humans or 250,000 mice!

With an LD/50 of 0.03mg/kg, it is ten times as venomous as the Mojave Rattlesnake, and 50 times more than the common Cobra. Fortunately, the Inland Taipan is not particularly aggressive and is rarely encountered by humans in the wild.

No fatalities have ever been recorded, though it could potentially kill an adult human within 45 minutes.

Top 2: Eastern Brown Snake

Don’t let the innocuous name of this snake fool you, 1/14,000 of an ounce of its venom is enough to kill an adult human.

Coming in a variety of species, the Eastern Brown snake is the most poisonous. Unfortunately, its preferred habitat is also along the major population centers of Australia.

The Brown snake is fast moving, can be aggressive under certain circumstances and has been known to chase aggressors and repeatedly strike at them. Even juveniles can kill a human.

The venom contains both neurotoxins and blood coagulants. Fortunately for humans, less than half of bites include, and they prefer not to bite if at all possible. They react only to movement, so stand very still if you ever encounter one in the wild.

Top 3: Blue Krait

The Malayan or Blue Krait is, by far, the most deadly of this species. Found throughout South East Asia and Indonesia, 50% of bites from the fatal Blue Krait are fatal, even with the administration of antivenin.

Kraits hunt and kill other snakes, also cannibalizing other Kraits. They are a nocturnal breed and are more aggressive under cover of darkness.

However, overall they are quite timid and will often attempt to hide rather than fight. The venom is a neurotoxin, 16 times more potent than that of a Cobra.

It quickly induces muscle paralysis by preventing the ability of nerve endings to properly release the chemical that sends the message to the next nerve.

This is followed by a period of massive overexcitation (cramps, tremors, spasms), which finally tails off to paralysis. Fortunately, bites from Kraits are rare due to their nocturnal nature. Before the development of antivenin, the fatality rate was a whopping 85%.

Even if antivenin is administered in time, you are far from assured survival. Death usually occurs within 6-12 hours of a Krait bite.

Also if patients make it to a hospital, permanent coma and even brain death from hypoxia may happen, given potentially long transport times to get medical care.

Top 4: Taipan

Another entry from Australia, the venom in a Taipan is strong enough to kill up to 12,000 guinea pigs. The venom clots the victim’s blood, blocking arteries or veins.

It is also highly neurotoxic. Before the advent of an antivenin, there are no known survivors of a Taipan bite, and death typically occurs within an hour.

Even with the successful administration of antivenin, most victims will have an extended stay in intensive care. It has been likened to the African Black Mamba in morphology, ecology, and behavior.

Top 5: Black Mamba

The feared Black Mamba is found throughout many parts of the African continent. They are known to be highly aggressive and strike with deadly precision.

They are also the fastest land snake in the world, capable of reaching speeds of up to 20km/h. These fearsome snakes can strike up to 12 times in a row. A single bite is capable of killing anywhere from 10-25 adults.

The venom is a fast acting neurotoxin. Its taste delivers about 100–120 mg of venom, on average; however, it can provide up to 400 mg.

If the poison reaches a vein, 0.25 mg/kg is sufficient to kill a human in 50% of cases. The initial symptom of the bite is local pain in the bite area, although not as severe as snakes with hemotoxins.

The victim then experiences a tingling sensation in the mouth and extremities, double vision, tunnel vision, severe confusion, fever, excessive salivation (including foaming of the mouth and nose) and pronounced ataxia (lack of muscle control).

If the victim does not receive medical attention, symptoms rapidly progress to severe abdominal pain, nausea, and vomiting, pallor, shock, nephrotoxicity, and paralysis.

Eventually, the victim experiences convulsions, respiratory arrest, coma and then death. Without antivenin, the mortality rate is nearly 100%, among the highest of all venomous snakes.

Depending on the nature of the bite, death can result at any time between 15 minutes and 3 hours.

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