In 1957, in a remote laboratory in Brazil, a controlled experiment went horribly wrong. Killer bees began invading the U.S., claiming thousands of lives and advancing at 15 miles every month. Learn how this lethal force of nature is an increasing threat.

The anaconda is by far the world's most massive serpent, and zoologist Nigel Marven believes this snake could reach more than 30 feet in length. In his search, Nigel guides a whistle-stop tour of South America's most wonderful wildlife locations.

Hunt down the deadliest snakes in Africa, creatures with the killing power to dispatch a man. Learn why these creatures attack, their methods and the power of their incredible strikes.

Enter the habitat of one of the most reviled creatures on Earth for a close encounter with a species that pre-dates the dinosaurs. Go face-to-face with ferocious crocs and witness their aquatic prowess, predatory instincts and mating rituals.

Intrepid zoologist Nigel Marven thought he knew all about the world's most dangerous fish from his encounters with sharks; but that was before he went face-to-face with piranhas. Nigel travels through the waterways of South America to find out the truth.