Step onto the set of Out of Africa, the sprawling Marsai Mara game reserve of Kenya and Tanzania, and you'll never forget the experience. If by some miracle, glimpsing the 'big five' - lions, leopards, elephants, rhino and buffalo - in their natural habitat leaves you cold, don't fret. They're just the beginning. The spectacle of the year is the millions-strong annual wildebeest migration thundering across the rolling grasslands.
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