To film hooded and harp seals in Greenland for instance, the crew had to cross from Norway to eastern Greenland, then locate the animals.

We used specialist ‘racer drones’ to overtake an avalanche, for instance, then fly at 150kmph beside it, and we reveal the coordinated hunting strategy of killer whales from the air. This episode follows the short polar summer: the sun does not set for months and the ice is largely gone. At the point in the sequence that our female leaves her youngster - alone on a small ice floe in the middle of freezing nowhere - you're emotionally engaged. We celebrate the wondrous life in these fragile ice worlds, but also land the message that they are changing rapidly on our watch, with potentially profound consequences for humanity.We had no choice but to spend the next three weeks sailing back to the Falklands, sometimes tacking to South Africa, sometimes tacking to Hawaii, beating against the headwind. She has been on the title for more than a decade, and in previous lives has also been the magazine’s section editor, acting deputy editor and production editor. With 24-hour daylight in which to hunt, the dedicated parents bring back meal after meal for their ever-growing brood.

It may have extremely dense fur, but if it’s to survive the Mongolian winter, it needs to catch lots of gerbils and voles.Previously undiscovered stories, from chameleons giving birth on the frosty slopes of Mount Kenya to endangered Amur leopards in the Russian forest and killer whales hunting Weddell seals on ice floes in the Antarctic, shed new light on the beauty and the peril of the world's most fragile ecosystems. This series tells the bigger story of all of our frozen worlds - which, incredibly, cover one fifth of our planet – at a time when they're changing faster than ever before. novaeangliae), the Antarctic minke whale ( Balaenoptera bonaerensis) being hunted by killer whales, and the Adélie penguin being hunted by south polar skua ( Stercorarius maccormicki). David Attenborough weighs in on the consequences of climate change -- but you won't hear him in the U. From polar bears to penguins, and from snow monkeys to Siberian tigers, each species must overcome a unique set of challenges to endure its extreme environment.