National Geographic Channel: Wild

Trek into the hidden battlefields of northern Botswana where lions and spotted hyenas clash in overlapping territories. With never-before-seen footage, much of it filmed at night, you'll uncover an intense and vicious blood feud that has been waged for millennia. Follow the Southern Clan, led by a powerful hyena matriarch whose firstborn female cub kills her sister at birth to assure her succession as leader of the clan. Lurk in the shadows as a lioness from the Central Pride gives birth to three cubs and then encounters a deadly Egyptian cobra. You'll be stunned by breathtaking chase scenes as the hyena matriarch is brutally killed by a male lion, throwing the clan into chaos. Discover nature's savage conflicts in this ancient rivalry between ETERNAL ENEMIES: LIONS AND HYENAS.

Known for their boundless grace and playful energy, captive dolphins are always eager to please and perform. But at home in the open sea, there's another little-known side to these awe-inspiring mammals that's powerful, cunning, and ruthless. Witness as a team of dolphins coordinates a devastating attack on a massive school of fish. See the largest, most fearsome member of the dolphin family—a killer whale—that can travel as fast as 30 miles an hour underwater to capture its next victim. Observe as dolphins learn from an early age how to hydroplane through mere inches of water to catch fish. You'll be amazed to explore the secret side of these sociable yet aggressive creatures.

Join the Kratts as they trek into remote habitats and live with sharks. They immerse themselves in the animals' worlds for weeks on end and the result is an unforgettable series of encounters that offer an intimate perspective of the wild world such as you've never seen before.

National Geographic embarks on a 250-mile adventure through unspoiled territory along the coast of British Columbia called the Great Bear Rain Forest. It is here that bear-hunting wolves take to the sea, grizzlies clash in titanic battles and wild salmon are the pulsing lifeblood of an entire ecosystem. As this precious habitat faces an uncertain future, threatened by chainsaws and fish farms, a team of dedicated scientists is racing to prove that it must be protected. Forming a wilderness detective squad, these experts are searching for the rare white spirit bear and collecting clues that will decipher the secret life of the forest's elusive inhabitants.

Few creatures are as mysterious and captivating as the whale. After hunting whales for generations, we have brought their widespread slaughter to an end, but these graceful giants still face threats on a number of fronts, and the battle to save them goes on. National Geographic takes an intimate look at four types of whales: pilots, humpbacks, bowheads and orcas. From the struggle to save a pod of pilot whales in the Florida Keys to the groundbreaking work of a scientist risking life and limb in the Arctic to the controversy over military sonar, the Special takes us to the front lines of whale conservation.

Get a stunning insider's view of one of our country's most impressive wild creatures - the American buffalo. Working over a period of eight years, Emmy-award-winning wildlife filmmaker Bob Landis documented the real dramas of bison in Yellowstone National Park. From epic battles with grizzly bears and wolves, treacherous winters to late summer mating season, Thunderbeast captures the awesome survival skills of this American icon.