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Swarm: Nature's Incredible Invasions

Episode 1: When Worlds Collide

Duration: 1 hour

on BBC Four HD

Documentary examining the world of animal swarms, using the latest camera techniques to look into the heart of a superswarm and reveal how they view our world. Show more

BBC Four HD

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BBC Four reflects arts, music and culture with an ambitious range of intellectually and culturally enriching programmes, taking an expert and in-depth approach to its subjects.