What Are the Most Venomous Snakes in the World?

4. Common Lancehead

Also known as the fer-de-lance, the common lancehead is known to reside primarily in South America's lowlands. It has a particularly fast-acting venom, and a strange side effect: temporary or permanent short term memory loss is almost always present in victims. Its venom affects the circulatory and nervous system, causing nausea and paralysis. It has an LD50 of 1.4 mg/kg. This snake can pose safety issues because of its habit of lying on footpaths and in coffee fields, where there is increased foot traffic.