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Researchers tracking the epic Serengeti migration reveal that humans have greater impact than food or predators

Across the Serengeti-Mara, an estimated 1.3 million wildebeest and 250,000 zebra are making their annual migration in one of the most spectacular sights of the natural world.

Six of these animals are currently wearing high-tech GPS collars, equipped with mobile phone technology - and over...  

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