Lions, polar bears, great white sharks, and crocodiles are not natural born killers. They enter a world full of danger, and must develop the skills needed to overcome prey with fatal precision. These creatures need years of practice to hone their hunting skills to become some of the most feared killers on the planet. Exposing real life-and-death struggles in dramatic second-by-second detail, "Built for the Kill" compares the abilities of top predators both on land and sea. Different predators in different worlds, but all have one thing in common. They're Built for the Kill..