Our Sharks DVD Collection details one of the earth's most lethal predators. Cold, silent, and deadly, this perpetual eating machine has fascinated and feared most viewers throughout the years.

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? Hidden beneath the surface of the sea is a phenomenon we know almost nothing about. On land, scientists have long studied the great animal migrations, but in the ocean some of the most spectacular events go almost unnoticed. Now, with an international team of scientists, National Geographic examines the movements of hammerhead sharks. How do they navigate? Do they possess an internal compass? What prompts them to seek out distant destinations? In a world threatened by overfishing and declining marine populations, understanding their behavior may be the key to ensuring hammerhead 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: With bloodlines going back over 350 million years, Great White sharks are older than dinosaurs and even trees. National Geographic 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.

• 3 discs; 156 minutes
• © 2010