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From ferocious dinner parties to plagues of Biblical proportion, Nat Geo WILD counts down the top 10 wildest swarms to discover that size really does matter. A swarm of killer bees will chase a target for a quarter of a mile, jump in the water and they'll wait for you to surface. And in Kenya, wildebeest make the largest migration of land mammals on the planet. Their yearly trek includes one huge risk: crossing the crocodile-infested Mara River, where 2,000 of their own kind won't make it.