They are the big bosses in their neighbourhoods and they've earned big respect from the other residents but in every case and in every place things can change in a heartbeat. The natural world has a way of challenging even the most majestic creatures and the natural cycle of life and death catches up with every living thing, regardless of their size or their power. Who will rise to their challenges? Who will be lost to stronger or bigger forces? We're ultimately faced with a disturbing question: what would these complex, sometimes brutal and completely balanced parts of paradise be without their carnivores? Ice Bear Polar bears may look soft and cuddly but they are one of the most ferocious predators in the world. Go deep inside the Arctic Norwegian islands, where this iconic mammal becomes victim to global warming and pollutants. Witness the serendipitous spectacle of nine polar bears devouring the remains of a sperm whale. A female polar bear named 'Binne' is on the prowl for seals in this seemingly pristine frozen icescape after sparsely eating during the winter months. This spring however, is strangely warm the first time in years that seals are nowhere to be found on the west coast of Svalbard. For this year, Binne finally finds all the fat she ll need - but what will happen next spring? King Bear Alaska's wilderness includes both coastal terrain and Kodiak Island with its ragged mountain peaks and crystalline, rushing rivers and streams. The brown bear finds prey here in the grassy, verdant interior, along the shorelines and in the freshwater that surges from the glacier melt. For the first time the defending brown bear will meet an equally worthy challenger...