In the second and final part of NATURE's miniseries "The Alps," experience the hostile and bitter cold ecosystems of the Alps, shaped by snow blizzards and avalanches.

A family of marmots prepares for their upcoming hibernation in a den 6 feet underground. As they prepare for their 6-month sleep, marmots dramatically lower their body temperature and survive on their body’s storage of fat and water. They only wake once every 2 weeks to rev up their heartbeat and visit a nearby tunnel used as a toilet.

Among the chamois in the Alps, the mood is tense. It's the mating season and rivaling bucks tax each other. Each buck needs to decide: Attack or retreat.

Go behind the scenes of NATURE's two-part miniseries "The Alps." The filmmakers braved frigid climates and tough terrain to capture the intimate moments of the animals living in the Alps.

When the ice on high alpine lakes begins to break, brown frogs appear with a mission. In the hundreds, brown frogs rush to the water, as none want to miss their annual springtime mating ritual.

In Europe’s highest mountain range, discover how Eurasian lynx, griffon vultures, ibex, marmots and more face extreme seasonal fluctuations, from volatile thunderstorms and landslides of summer to avalanches and frozen temperatures of winter. In Part One of the miniseries "The Alps", enjoy the Alps in spring and summertime as newborn animals grow up to face the coming brutal winter.

Eight out of ten eagle kills are marmots, mostly youngsters. To protect her young, mother marmots are always on the lookout for deadly eagles.

NATURE is a voice for the natural world. As one of the most-watched documentary film series on public television, NATURE delivers the best in original natural history films to audiences nationwide.

Get an intimate look at the wildlife of Lapland, a region in northern Finland, the fabled home of Santa Claus and actual home of reindeer, great gray owls, wolverines, eagles, wolves, musk oxen, brown bears and more.

Orcas have a special way of hunting herring, through a quick turn and their powerful tails sending shockwaves through the water to stun the fish. Large shoals of herring gather in the winter months, and it’s not just orcas that take advantage of the feast.

Witness the mass migration of hundreds of thousands of reindeer in Lapland. As the snow begins to thaw with the change of seasons, the reindeer need to reach their feeding grounds by the coast, before the snow gets too soft to run on.

On Koram Island, beach-combing long-tailed macaques have developed impressive tool-using skills, which are having some surprising consequences. If these monkeys continue to over-harvest their environment, the shellfish could disappear. This is the first reported case of a tool-using animal, other than humans, overexploiting a natural resource.

Many young orangutans do not survive in the wild after being released from human care because they often lack the skills needed to survive in the canopy. Conservationist Dr. Signe Preuschoft had an idea to teach these young orangutans to climb.

Dusky langurs' once pristine forests are now bisected by busy roads. To move through their territory, they must risk crossing dangerous traffic every day. After witnessing their struggle, Local Researcher Jo Leen Yap decided to build a monkey bridge.

More than half of the world’s primates are under threat. Meet the scientists making groundbreaking discoveries to safeguard their future.

For a tiny golden-headed lion tamarin mother, pregnancy and birth take a huge toll. Therefore, it's the tamarin dad who shoulders the burden of responsibility of taking care of the young.

Watch the first moving images of a Tapanuli orangutan mother and her infant. When the Tapanuli orangutan was named in 2017, it became the newest, and in the same moment, most endangered great ape on Earth.

Family is everything for primates. They have the most complex social lives of any animal group on the planet. Meet devoted monkeys’ uncles, playmate apes and tender troops.

Monkey see, monkey do. From baboons facing down leopards to lemurs exploiting a jungle pharmacy or rhesus macaques charming their way to an easy life, discover the survival strategies used by primates, often in the most unexpected places.

Silverback mountain gorillas have a fearsome reputation with aggression that helps maintain family order. However, not everyone shows this gorilla troop leader the respect he deserves.