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"The Crossing" - A wildebeest calf makes spectacular year-long journey, an arduous 3,000km round trip across Tanzania's Serengeti and Kenya's Masai Mara. In part two, the migration reaches the Masai Mara where, for the calf, the river presents his greatest challenge yet.

Episode Title: Trek: Spy on the Wildebeest (2)
Airs: 2007-01-21 at