The gold-ringed cat snake or mangrove snake (Boiga dendrophila) is a species of rear-fanged colubrid. It is one of the biggest cat snake species, averaging 6–8 feet in length. It is considered mildy-venomous, but there has never been a human fatality.
Claudius would pin this to gain the best information on the most powerful snake that could kill someone. Claudius used snake venom to kill Old Hamlet. He needs to know the most successful poison to use in order for his plan to work. This scholarly article helps you figure how to tell the difference between a poisonous snake and a nonpoisonous snake, describes how snake venom kills someone and how to make the poison undetectable. That is why this would be helpful for Claudius.