National Geographic Society

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Flamingos swarm all over the rift valley lakes of East Africa.  A single flock contains half a million birds.  Bathed in steam from hot springs, flamingos are one of the only creatures able to thrive in the hot corrosive water in the caustic soda lakes.

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We're counting down the top ten ultimate swarms in the natural world to discover when it comes to animal get-togethers, size really does matter.