Deep in the heart of South America lies one of the most spectacular secrets of the natural world. Over two and a half kilometres long - nearly three times the size of Niagara - with up to 300 individual waterfalls - this is a one hour special on a place like no other, where enough water flows over the edges every day to supply the city of London for more than a year - this is the Iguaçu Waterfall. On the borders of Brazil and Argentina the waterfalls sit in the middle of lush damp rainforest. We follow the dangerous lives of great dusky swifts living in their thousands behind the raging wall of water that makes up the falls. And extensive families of raccoon-like coatis living a precarious life high in the trees. Other animals such as the elusive jaguar, raucous weaver birds and mysterious tapir also roam here under the protection of a few dedicated ranger teams. It's time ...
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