Question: are all king cobras poisonous?
Answer: The king cobra (Ophiophagus hannah) is the only member of its genus. “The king cobra is the longest species of venomous snake in the world,” said Viernum. ... Though there are other snakes with more potent venom, the amount of neurotoxin that a king cobra can emit in one bite is enough to kill 20 people — or one elephant.