Diablo the giant otter lives in a lake in the jungles of Peru, with his unruly family of six cubs. Even at the tender age of six months, they need to learn how to survive in this dangerous paradise. Their dad teaches them to swim and eventually to catch piranha for themselves, but they must also learn to stay away from the neighbours from hell - the giant caiman. These large members of the crocodile family are a real threat to the giant otter family and Diablo must go to extraordinary lengths to try to protect his cubs. Charlie Hamilton-James returns to the place he first filmed Diablo. Following the family over several months, sometimes in very difficult conditions, he discovers how perilous a home this is for the cubs and watches them develop under the careful guidance of their father. He also films remarkable scenes of the giant otters fighting caimans.
Intelligence and adaptability allow primates to tackle the many challenges of life, and this is what makes our closest relatives so successful. This resourcefulness has enabled primates to conquer an incredible diversity of habitat. Hamadryas baboons live on the open plains of Ethiopia in groups up to 400 strong. Strength in numbers gives them some protection from potential predators. But, should their path cross with other baboon troops, it can lead to all-out battle, as males try to steal females from one another, and even settle old scores. Japanese macaques are the most northerly-dwelling primates and they experience completely different challenges. Some beat the freezing conditions by having access to a thermal spa in the middle of winter. But this privilege is only for those born of the right female bloodline. For western lowland gorillas, it's the male silverback that leads his family group in the rich forests of the Congo basin. He advertises his status to all with a powerful chest-beating display. Most primates are forest dwellers, and one of the strangest is the tarsier – the only purely carnivorous primate. As it hunts for insects the tarsier leaps from tree to tree in the dead of night, using its huge forward-facing eyes to safely judge each jump. Good communication is essential for success in primate society.
In the first episode, the team uncover the hidden lives of three iconic animals. In the Kalahari Desert the team put cameras on wild meerkats for the first time, allowing scientists to finally understand what these miniature mammals get up to underground. Heading to Cameroon, Gordon works with scientist Mimi Swift, who is desperate to understand whether Kimbang, a four-year-old orphan chimp, has the skills she needs to be able to join a chimp family living wild in the forest. Leaving Africa for Argentina, the team have penguins carry tiny cameras far out to sea on an epic journey of up to 300 kilometres (200 miles). For the first time, scientists are able to see the tactics these charismatic characters use to catch their prey.