S1, E1: The contests between predators and prey are the most dramatic events in nature. This is a look at the extraordinary range of techniques predators use to catch their prey, from a leopard using all its powers of stealth to stalk impala in broad daylight and wild dogs, whose tactic is to wear down their prey over long distances, to Nile crocodiles, the planet's most patient predators, and killer whales who use teamwork and intelligence to take on humpback whales.