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For example, Pit Vipers are poisonous but rarely prove fatal to human beings. The poisonous Big Four are the Cobra, the Krait, the Russel's Viper, and the Saw-Scaled Viper. Of these the most poisonous is the common Krait. Its venom is about four times more toxic than that of the Cobra. All sea-snakes are poisonous.
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