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The Gaboon Viper (Bitis gabonica) has the longest fangs and the highest venom yield of any venomous snake in the world. Gaboon Vipers can be found in West, Central and parts of East Africa, they prefer forested areas. Adults reach an average length of around 5 feet. While the Gaboon Viper delivers a huge dose of venom, the venom is not as toxic as some of the other snakes on this list. A single bite could kill a man however. Gaboon Vipers are very interesting looking snakes with a huge triangular shaped heads and pretty black, brown and pink markings. Gaboon Vipers are quite passive and rarely bite unless provoked or stepped on (even then they don't always bite).