David Tennant narrates this new two-part documentary looking at the awe-inspiring world of animal swarms. The latest camera techniques take viewers to the heart of the action, revealing how the creatures view the world around them, while footage from camcorders and mobile phones captures the impact they can have. Highlights include killer bees mounting an attack on a football match in Costa Rica, a sea of mice raiding farms in South Australia and 10 million starlings flying over Rome. Hopefully after watching this you'll have a renewed appreciation for our damp little island, where such things never happen...