Ten Deadliest Snakes with Nigel Marven

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?

The USA is the land of the rattlesnake - there are over 30 species of rattler found here. But what's the deadliest serpent in the country?

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?