The naturalist gets up close and personal with crocodiles - one of nature's most fearsome predators - immersing himself in their world to reveal what makes them so deadly. He heads for the waterways of South Africa's Ndumo Game Reserve, home to the third largest population of Nile crocodiles. Entering wild crocodile-infested territory escorted by an armed safari guide, he crawls close to the crocs' kill zone so he can see these incredible creatures in the wild