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 camera woman 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.