A look at some of the planet's great gatherings, creatures that come together in inconceivable numbers-sometimes in millions, billions, and even trillions. Some gather to breed, migrate, for protection, or simply to keep warm. But in the process, a kind of super-organism is created in which individual intelligence is superseded by a collective consciousness that shares information and moves with a single purpose for the benefit of all.

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Tags: PBS, Nature, The, Gathering, Swarms