Islands are wildlife sanctuaries, but surviving in isolation comes with extreme challenges

A unique glimpse into the lives of mountain-dwelling animals.

Jungles provide the richest habitats on the planet - mysterious worlds of high drama where extraordinary animals attempt to survive in the most competitive place on earth. Flooded forests are home to caiman-hunting jaguars and strange dolphins that swim amongst the tree tops, while in the dense underworld, ninja frogs fight off wasps and flying dragons soar between trees. Acrobatic indri leap through the forests of Madagascar, while the jungle night conceals strange fungi and glow-in-the-dark creatures never filmed before.

The world's deserts are lands of extremes that force animals to come up with ingenious ways of coping with hostile conditions, giving rise to the most incredible survival stories on earth. A pride of desert lions are so hungry they risk hunting a giraffe several times their size, while male sandgrouse fly 120 miles each day to the nearest waterhole and dice with death to collect water for their chicks. Filmed for the first time, a tiny bat does battle with one of the world's deadliest scorpions, and in Madagascar, a locust swarm of biblical proportions is seen as never before.

Grasslands cover one quarter of all land and support the vast gatherings of wildlife, but to survive here animals must endure the most hostile seasonal changes on the planet.From Asia's bizarre looking saiga antelope, to the giant ant-eaters of Brazil, grassland animals have adapted in extraordinary ways to cope with these extremes. In the flooded Okavango, lions take on formidable buffalo in epic battles, on the Savannah bee-eaters take advantage of elephants to help catch insects and on the freezing northern tundra, caribou embark on great migrations shadowed by hungry Arctic wolves. Captured in stunning ultra-high definition detail, Planet Earth II is an immersive exploration of the islands, mountains, jungles, deserts, grasslands and cities of the world.

Cities are growing at a faster rate than any other habitat on Earth. They may seem an unlikely place for animals to thrive, but for the bold this is a world of surprising opportunity. Leopards prowl the streets of Mumbai, peregrine falcons hunt among New York's skyscrapers and a million starlings perform spectacular aerial dances over Rome. We welcome some creatures into our cities. In Jodhpur, langurs are revered as religious deities and in Harar locals live in harmony with wild hyenas. Many animals, however, are struggling to cope in the urban jungle. As the architects of this environment can we choose to build cities that create a home for both us and for wildlife? Captured in stunning ultra-high definition detail, Planet Earth II is an immersive explora