Natural history series revealing a totally new perspective on wildlife at night. Now the expedition travels south to a flooded forest in the heart of the Amazon. Large mammal expert Bryson Voirin encounters a curious sloth whilst camerawoman Sophie Darlington spends stormy nights precariously perched high in the jungle canopy, attempting to film the only nocturnal monkey in the world. Further south, Gordon Buchanan heads to the largest wetland on earth in search of giant anteaters and enters a strange deserted house that's been taken over by vampire bats. And Dr. George McGavin abseils deep into the perpetual darkness of a giant cave system - cut off from the light for millions of years. Deep inside, he and the team discover species new to science.

Natural history series about wildlife at night culminates at the wild and windswept tip of South America. Coming face to face with the widest-ranging cat in the Americas - the puma - camerawoman Justine Evans attempts to film their nocturnal hunting behaviour for the first time.

Even further south, Gordon Buchanan dives into the icy waters of the Strait of Magellan to solve a mystery - scientists have heard humpback whales moving close to the shore at night, but have no idea what they could be doing. And Dr. George McGavin attaches a miniature tracking device to a vampire bat's back to discover whose blood it is feeding on.