1. Common Lancehead (Bothrops atrox, also known as the fer-de-lance)
The genus Bothrops currently contains about 30 species of heavy-bodied terrestrial pit vipers found (with one exception) in South America. Although all are dangerous, the common lancehead, of central South America, is the most notorious, causing perhaps a few hundred deaths a year even when antivenom is available.

2. Ocellated Carpet Viper (Echis ocellatus)
Although it appears on few lists of the most deadly venomous snakes, this 2-foot carpet viper of the savannas of western Africa appears to cause more deaths than all other African species combined, perhaps more than 20,000 per year among agricultural workers.

3. Indian Cobra (Naja naja)
The common cobra of most of Pakistan, India and Sri Lanka, Naja naja is recognized by typically having a pair of pale spots (the spectacles) on the spread hood. The closely related N. kaouthia of Southeast Asia generally has a single dark-centered pale spot on the hood, but cobra species are variable and not easy to distinguish.

4. Indian Krait (Bungarus caeruleus)
Although seldom even 4 feet long and relatively slender and not inclined to bite, Indian kraits and the related many-banded krait (Bungarus multicinctus) probably cause thousands of deaths each year across southern Asia. What appears to be a many-banded krait in 2001 bit and killed the noted American herpetologist J. B. Slowinski while he was collecting in Myanmar.

5. Eastern Brown Snake (Pseudonaja textilis)
The majority of deaths from snakebites in Australia over the past two decades (perhaps 15 of fewer than 30 total) have resulted from bites of the eastern brown snake and the western brown snake (P. nuchalis). Together, these two snake species span virtually the entire Australian continent, with the eastern brown snake also extending into New Guinea and causing some deaths there.

6.Neotropical Rattlesnake (Crotalus durissus)
This large (males sometimes attain 5 feet in length), heavy-bodied rattlesnake has a discontinuous range from southern Mexico over parts of Central America and northern South America and then a more uniform range south of the Amazon into Argentina. The neotropical rattlesnake is easily recognized by the sharply defined dark diamonds on the back in combination with a pair of broad dark brown stripes running from the top of the head onto the body,

7.Black Mamba (Dendroaspis polylepis)
At 10 feet or more, the black mamba is one of the largest elapids, and it also is considered one of the most deadly snakes. The venom has an LD50 of 0.28 mg/kg, with enough venom in a full bite to (in theory) kill 10 humans. Black mambas are noted for standing their ground when cornered, being vicious biters under such circumstances.

8.Russell’s Viper (Daboia russelli)
This large (6 feet or longer), beautifully marked viper may be a complex of species ranging from Pakistan to Sri Lanka and Myanmar to Indonesia and Taiwan. Its color pattern of large dark lozenges in regular rows on a tan body is distinctive in the area, and the snake is well known and greatly feared.

9.Indian Saw-Scaled Viper (Echis carinatus)
Although small (adults are often only 10 inches long, and seldom more than 30 inches) and slender with a short head, Indian saw-scaled vipers are among the most common snakes of Sri Lanka and southern India, leading to many snakebite accidents among field workers.

10.Tiger Snakes (Notechis scutatus and relatives)
Tiger snakes are highly variable brown to black snakes of southern Australia that can often attain a length of 5 feet. Although well known for the toxicity of their venom, they are considered relatively calm snakes that are not likely to bite unless greatly stressed.

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