Through the use of stealthcam, cameras built inside capsules resembling everything from crocodiles and hippos to mudpiles and dragonflies, the magnificent journey of more than a million wildebeest across Tanzania's Serengeti Plain has been captured like never before. The migration is the largest of land animals on the planet and the perils on the 3000km round trip, which the wildebeest take annually for food and water, are numerous. Wildebeest are on the hit list of every African predator. By land and across water, their lives are in constant danger from cheetahs, lions, hyenas and crocodiles, as well as nature's most gruelling physical challenges. Their coming signals food for their enemies on the plains and in the rivers. Their enemies wait to pick them off at the slightest chance. So survival tactics are called for from the first minutes of a newborn wildebeest's life.