Nigel explores almost every type of environment in China, climbing steep forested slopes and even wading into a sea cave to track down his top ten snakes. But which is number one?

Costa Rica has two venomous snakes for every hectare of land, including some of the world's most feared tropical snakes. Which of these kings of the jungle will make it to the top of Nigel's list?

With almost 2000 snakebites causing 250 deaths every year, South Africa is a hot-spot for deadly snakes, with some of the most feared serpents in the world. But what's the most deadly?