The great wildebeest migration from the Masai Mara National Reserve in Kenya to Tanzania's Serengeti National Park is a spectacle of life and death witnessed by few humans... until now. Baron Hugo van Lawick who has made the Serengeti his home for over 25 years, has filmed this remarkable epic of survival - the greatest migration of land animals on the planet - in vivid, riveting detail. At the start of the migration the wildebeest herd is one and half a million strong. But, the journey is plagued with predators. Cheetahs stalk and chase the strays. Hyenas and wild dogs shadow the herd and attack the calves. Leopards drag their kill into the trees. Lions seem to appear from nowhere - springing from the tall grasses. And crocodiles - monsters over 20 feet long - lurk in the shallows of the Grumeti River waiting for the thirsty herd. But just like every year, the wildebeest complete their great African migration while birthing an incredible half a million young along the way.