In the centre of South America, a vast, wild expanse; the world’s largest wetland. But this is no ordinary swamp. Every year it’s drowned by immense floods, then parched by severe drought. Yet while people struggle to cope, the Pantanal hosts some of the greatest gatherings of animals on the planet, rivalling Africa’s spectacular wildlife. As the dry season takes hold, caiman gather to breed and fish – forming the greatest concentration of reptiles on earth. Rare Giant River Otters have found refuge here and patrol the waterways in family packs. With so much food on offer, jaguars flourish - growing to be the largest in Latin America. Surviving groups of Bororo Indians join together in fishing parties, using age-old techniques to harvest the Pantanal’s riches. When the rains come the Pantanal sinks under 5m of water, and one of the world’s largest waterfalls, Foz do Iguacu, becomes a breath-taking spectacle.