National Geographic 125th Anniversary Nature Collection

Enter the mysterious, unchartable wilderness of Okefenokee, 700 square miles of swampland on the Georgia-Florida border. Eerie, forbidding, and darkly beautiful - Okefenokee is ruled by a descendant of the dinosaur, the fearsome alligator. Day and night the alligator glides silently through its steamy realm, stony eyes just above the waterline, mouth held in a seemingly perpetual smile. Join scientists as they study the behavior of these huge and powerful reptiles in Realm of the Alligator.

Monster of the imagination and monarch of the wild, the great grizzly bear has long played a part in myth and legend. Despite man's combined fear of and fascination with the grizzly, the bear survives today only by consent of his one real contender - man. Travel from Alaska's Brooks Range to Wyoming's Yellowstone National Park for a fascinating portrait of this powerful intelligent and extremely aggressive creature in The Grizzlies.

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.

Of all the creatures that walk the planet, the elephant is the biggest, strongest, and among the most intelligent. From Sri Lanka to Kenya, "Elephant" is a charming, sometimes alarming, in-depth look at this magnificent animal and its precarious future. In Asia, watch man and beast work side-by-side in a land where the elephant is an object of worship and affection. In the open spaces of Africa, marvel at the behavior of wild elephants as they communicate over great distances. And finally, witness the birth of a baby elephant as it struggles to its feet for the very first time.

In all of Africa, there is no other place like Okavango Delta - a watery refuge in the heart of one of the world's greatest deserts. In the midst of the dry season, floodwaters from Angola can double the delta size to some 5,000 square miles, spreading like a giant hand across Botswana.

Tigers of the Snow presents the beautiful one-hour program on these endangered animals from award-winning wildlife filmmaker Mark Stouffer.