Swarm: Nature's Incredible Invasions Season 1 Episode 2

One Million Heads, One Beautiful Mind

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Season 1 Episode 2

Concluding the two-part documentary looking at awe-inspiring animal swarms with an examination of collective intelligence as a means of escaping predators. The latest camera techniques show how millions of free-tailed bats form a living tornado and shoals of herring shape-shift across the ocean floor. Plus, how some shorebirds synchronise their migration with the spawning season of the horseshoe crab. David Tennant narrates

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