Great Migrations

At a riverbank in Africa's Serengeti, thousands of migrating wildebeest try desperately to cross as terrifying crocs feast on the galloping herds--which must attempt the river for a chance at survival. In the Falkland Islands, the albatross--king of migrations--journeys thousands of miles to nest despite the deadly cara cara, a predatory raptor. For countless animals species, migration is a dramatic, dangerous, and crucial undertaking...