Hammerhead Highway: Sharks have thrived in the oceans for over 350 million years, but around 20 million years ago a new species emerged in the fossil records in a form unlike ever seen before...the Hammerhead Shark. Why did this bizarre looking creature evolve and how has it survived? Scientific evidence suggests that Hammerheads seek out distant destinations but is there a method to their travels? Threatened by declining populations the HAMMERHEAD HIGHWAY may be the key to their survival. Tiger Sharks: Take a never-before-seen look at the world of a tiger shark! Infamous for its unmistakable stripes and indiscriminate appetite, the tiger shark is one of the most ferocious sharks in the sea. Now, get closer than ever for a most intimate glimpse of this fearsome yet fascinating predator! Ultimate Shark: National Geographic shows you a different look at natures near perfect predatorthe great white shark. With bloodlines going back over 350 million years, they are older than dinosaurs and even trees. Only now are we starting to understand the true power of great whites. Ultimate Shark breaks down dramatic great white-human attacks and demystifies the true motives and power behind great white shark behavior. Every minute is loaded with cutting edge science, state of the art graphics and gripping stories of great whites and the people who survived their harrowing encounters.