Question: are vipers poisonous to humans?
Answer: Most are harmless, but others have potent venom and at least five species, including the boomslang (Dispholidus typus), have caused human fatalities. True vipers, including the Russell's viper, saw-scaled vipers, puff adders and pit vipers, including rattlesnakes, lanceheads and copperheads and cottonmouths.