Wildlife in the massive Central American rain forest stretching across parts of Belize, Costa Rica and Panama. Observed: three-toed sloths, army ants and a jaguar.

The powerful McNeil River Falls is a very popular nursery spot for growing grizzly bears. Every summer, hundreds of the huge animals gather at the falls to feast on migrating salmon and find mates.

Program One KILAUEA: MOUNTAIN OF FIRE Ecosystems on Big Island Face No Small Challenge Kilauea, violent and beautiful, destructive and creative, continually molds Hawaii's Big Island. Kilauea: Mountain of Fire explores the incredible power of the volcano and the challenges of like in its shadow. Academy-winner F.Murry Abraham narrates. TV-G Program Two VIOLENT HAWAII From Rivers of Lava Springs Bedrock of Life Imagine a lost word with lava flowing down mountainsides, violent storms, monster waves, rock sides and even heavy snows. This isn't science fiction. It's Hawaii-where spectacular beauty was forged by fire, and created by Turbulent natural forces. Tony Award-winner James Naughton narrates this riveting HD visual journey. TV-G

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.

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.

An examination of the extinction threat faced by frogs, which have hopped on Earth for some 250 million years and are a crucial cog in the ecosystem. Scientists believe they've pinpointed a cause for the loss of many of the amphibians: the chytrid fungus, which flourishes in high altitudes. Unfortunately, they don't know how to combat it. Included: an isolated forest in Panama that has yet to be touched by the fungus, thus enabling frogs to live and thrive as they have for eons.

A look at the extraordinary abilities of squirrels, from the brainy fox squirrel to the acrobatic gray squirrel to the problem-solving ground squirrel.

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.

Each year, far from human eyes, a remote expanse of Botswana's Makgadikgadi salt pans hosts one of Africa's last great spectacles when thousands of striped nomads wander the breathtakingly beautiful but barren landscape. It is only by the grace of isolated summer rains that the zebras can survive here at all. Family groups gather together to follow the rains, driven by a constant search for better grazing on islands of grass that dot the pans. Meerkat families watch the zebras come and go, and families of lions wait for them along their grueling trek, hoping for a chance to bring one down. Their journey is one that is sometimes limited by the fragility of new life, but always made possible by the strong family ties that help animals survive in one of Africa's most surreal landscapes. It's a tale of loyalty and sacrifice, of home and exile, of death and new life, in southern Africa's largest zebra population.

Florida is home to beaches, coral reefs, pine forests and the famous Everglades wetland, but a growing human population and abandoned exotic pets like pythons are threatening this wild paradise. Can Florida’s ecosystems continue to weather the storm?