Gorillas live in complex social groups led by a dominant male ‘silverback’. He is intelligent and powerful, fiercely leading his troop through the dangers of the jungle. Gorillas are like us in so many ways, but their existence is under threat.
Our journey begins with David at the North Pole, as the sun returns after six months of darkness. We follow a pair of courting polar bears, which reveal a surprisingly tender side. Next stop is the giant Greenland ice cap, where waterfalls plunge into the heart of the ice and a colossal iceberg carves into the sea. Humpback whales join the largest gathering of seabirds on earth to feast in rich Alaskan waters. Further south, the tree line marks the start of the Taiga forest, containing one third of all trees on earth. Here, 25 of the world's largest wolves take on formidable bison prey. At the other end of our planet, the Antarctic begins in the Southern Ocean where surfing penguins struggle to escape a hungry sea-lion and teams of orcas create giant waves to wash seals from ice floes -a filming first. Diving below the ice, we discover prehistoric giants, including terrifying sea spiders and woodlice the size of dinner plates. Above ground, crystal caverns ring the summit of Erebus, the most southerly volcano on earth. From here we retrace the routes of early explorers across the formidable Antarctic ice-cap - the largest expanse of ice on our planet. Finally, we rejoin David at the South Pole, exactly one hundred years after Amundsen then Scott were the first humans to stand there
Slip through millennia-old caves in the Yucatan Peninsula of Mexico. These spooky, labyrinth-like places were considered magical as early as the Mayan era. Plus you can hitch a ride with sucker fish, dodge gigantic ocean devil fish and be entranced by the dance of a majestic 6-metre long manta ray.