South America - the most species rich continent on Earth.
From the volcanoes of the Andes to the Amazon, the world's largest rainforest, animals here must specialise if they are to carve out a niche.
In Patagonia, a puma mother draws on a lifetime's experience to catch prey three times her weight. In the cloud forest, rarely seen Andean bears clamber 30 metres into the canopy to find elusive fruit.
Poison dart frogs use ingenious methods to keep their tadpoles safe, whilst anacondas stalk capuchin monkeys. At Igauzu Falls, swifts make death-defying flights through one of the biggest waterfalls on Earth.