A look at how sharks are the ocean's great predators, living in every ocean and hunting in many ways. Blacktip sharks hunt in packs and herd fish into baitballs, tasselled wobbegongs are ambush hunters, and Greenland sharks live under the arctic ice.
Sharks are more than just hunters, and scientific discoveries reveal a hidden side to their character. They have an intricate social life, complex courtship rituals, surprising ways of bringing up their young, and extraordinary powers of navigation.