Length: 4 to 5.5 feet
Location: India, Southeast Asia, Southern China, Taiwan
Poisonous Effects: Reportedly, this venomous snake responsible for more human deaths than any other. When the Russell's Viper feels threatened, it twists into a tight coil, hisses at its prey, and strikes quickly.
The Daily Mail reported that 30,000 people a year are bitten by the Russell's Viper, and many die without receiving help.
Terrifying Tale: After Sri Lankan students found a two-headed serpent in 1997, they initially deemed it a python. But wildlife officials concluded it was none other than the deadly Russell's Viper. At just three months old, the freakish creature was a double threat, considering Russell's Vipers are the main causes of snake bite deaths yearly in Sri Lanka. This deadly creature had four eyes, two brains, two tongues, two noses, and two esophagi.