Rubin Tarrant Productions

As the ice shrinks in the Arctic, polar bears are struggling to survive in a fast melting world. Although classified a marine mammal, the polar bear is not adapted to hunting in the water. And it is certainly no match for the world's greatest aquatic hunter -- the killer whale. In the last few years, scientists have noted an ever-growing number of killer whales in Arctic waters in the summer months. More and more have been attracted to these hunting grounds by the growing expanse of open water. They attack the same prey as the polar bears: seals, narwhal, belugas and bowhead whales.

Once facing extinction, Asia's last wild lions live dangerously close to India's villages.

As little as 15 years ago, no one had captured the unforgettable image of a leopard in its ghostly nocturnal stalk. Viewers had never seen intimate portrayals of the sleek and elusive serval, or witnessed the nighttime romps of the beautiful black-eared caracal. The team of Owen Newman and Amanda Barrett filled those gaps with a series of spectacular breakthrough films in the 1990s. Among the first to apply infrared light and night vision goggles to wildlife studies, they combined technology with intrepid determination and a strong dose of luck, illuminating the cats we hardly knew, and giving us fresh insights into those we only thought we knew, such as lions and cheetahs

Naturalists Charlie Russell and Maureen Enns film recently discovered grizzlies on Siberia's Kamchatka peninsula.

This installment of the series produced by the acclaimed Nature team showcases the grandeur of the Emerald Isle. Going beyond the usual travelogue, the film takes viewers to places they've never been before so they can truly appreciate the natural treasures of the country: the lush plant life; the animal families that call the country home, including peregrine falcons and dolphins; and the magnificent countryside, from the mountains to the bogs.

The Okavango River empties into desert; wildlife such as fish eagles, Nile crocodiles, lions and sitatunga antelope.

The highest mountain range in the world, the Himalayan range is far reaching, spanning thousands of miles, and holds within it an exceptionally diverse ecology. Coniferous and subtropical forests, wetlands, and montane grasslands are as much a part of this world as the inhospitable, frozen mountaintops that tower above. The word Himalaya is Sanskrit for abode of snow, fitting for a stretch of land that houses the world’s largest non polar ice masses. Extensive glacial networks feed Asia's major rivers including the Ganges, Indus, and Brahmaputra. More than a billion people rely on these glacier-fed water sources for drinking water and agriculture. The Himalayas are not only a remarkable expanse of natural beauty. They're also crucial for our survival.

White lions are among the rarest and most treasured animals in the world. Rarer still is their survival in the wild. Their white color stands out in Africa’s wild bush country, increasing their risk of being targeted and killed by rival predators and marauding adult male lions. Only three white cubs have reached adulthood in the wilds of South Africa since white lions were first documented there in 1975. Now, two white cubs, sisters, have beaten the odds, surviving all the challenges of their youth with the help of two remarkable lionesses—their mother, Matimba, and their aunt, Khanya. Without an adult male lion to protect their small pride, Matimba and Khanya must rely solely on their own knowledge, strength and courage to protect their family.

Embark with conservation ecologist Chris Morgan on a great challenge: to find and film the Siberian tiger.

In the animal world, as in our own, looks aren’t everything. In fact, some of the most aesthetically challenged creatures — from warthogs and proboscis monkeys to bull elephant seals — are also the most fascinating. A stunning variety of these ghastly yet glorious forms are explored in NATURE’s The Beauty of Ugly.

PBS Nature.

For two years Simon King takes on the role of mother to two male cheetah cubs, Toki and Sambu, orphaned when their mother was killed by a lion

From PBS and NATURE - From the wilds of Costa Rica to the suburbs of our own country, parrot owners, rescuers, breeders, and biologists involved in conservation programs share their stories and the stories of their parrots in this bittersweet and unforgettable film about the difficulties and consequences of keeping and caring for parrots as pets.