If what you inquiring about is saw-scaled vipers then they are a small highly toxic group of snakes in the genus Echis, which is comprised of many highly variable species which can be difficult to differentiate. They are known for having an extremely unpleasant disposition and an extremely dangerous venom, that and the fact that they occur in large numbers near rural human habitation makes them one of the leading causes of snakebite and snakebite fatalities worldwide.
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