S1.E4 ∙ Rivals

Coral reefs around the world are vanishing at an unprecedented rate. A team of divers, photographers and scientists set out on a thrilling ocean adventure to discover why and to reveal the underwater mystery to the world.

A nature documentary that follows two leopard cubs as they make the journey from infancy into adulthood.

It's Christmas, and wildlife cameraman Gordon Buchanan travels to the frozen north, deep inside the Arctic Circle, to meet the ancient Sami people and the animals they hold so close - reindeer. Known as the reindeer people, the Sami were traditionally nomadic, relying on their precious animals to help them survive the Arctic's harsh winters. Gordon lives with a Sami family in Finnish Lapland to experience their unique culture and to learn about their special bond with reindeer. He works to earn the trust of his own reindeer companion, before leaving his adopted family behind and setting off alone into this land of ice and snow. With only his reindeer to guide him, but armed with the knowledge of his hosts, Gordon wants to immerse himself in this frozen wilderness and attempt to witness the natural phenomenon the Sami most revere - the magical Northern Lights.

A documentary on insect life in meadows and ponds.

Athena is a mother who will do everything in her power to protect her herd when they are forced to leave their waterhole. This epic journey, narrated by Chiwetel Ejiofor, takes audiences across the African savannah, and into the heart of an elephant family. A tale of love, loss and coming home.

For more than 20 years anthropologists have been researching the social behavior of a chimpanzee clan in Uganda's Kibale National Park. They gained new insights about the violence, brutal power struggles, rivalry, enmity, friendship and diplomacy within the large, strictly hierarchical primate group. The males set the tone. The intelligent individuals have the ability to network and forge alliances. War against external conspecifics and brutal hunting of other monkey species is not uncommon. The conclusion is that animals are by no means better than humans.