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Swarm: Nature's Incredible Invasions

Episode 2: One Million Heads, One Beautiful Mind

Duration: 1 hour

on BBC Four HD

Documentary series revealing the swarm intelligence that lies behind animal invasions, featuring bats, herring, flies, crabs and fire ants. Show more

BBC Four HD

About BBC Four

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.