Dylan Dreyer returns to Patagonia in South America to learn about amazing animals, from sea lions to armadillos, that find ways to thrive in the coldest, steepest and most dangerous places on Earth and make them home.

Dylan Dreyer travels to Asia to visit the highest peaks in the world -- the Himalayas -- and witness crane migrations and the daily life of snow leopards, as well as explore what it takes to live in this challenging climate and landscape.

Dylan Dreyer returns to some favorite islands around the world, including the Amazon River Islands, where red howler and squirrel monkeys are at home in the trees; in the Philippines, unbelievable insects include a tree nymph becoming a butterfly.

Dylan Dreyer returns to South America to visit some favorite animals, including pumas, egrets and crocodiles, who make their homes around Venezuela's Orinoco River, and red howler monkeys and harpy eagles in the Amazon rainforest.

Dylan Dreyer returns to the Philippines, where people call the mangrove forests home and use the rivers and streams as a means of transportation, food and fun; in the trees, macaques play and tree nymphs turn into beautiful butterflies.

Dylan Dreyer explores South America's Andes Mountains, where the tumultuous weather and treacherous heights cause many unusual animals to form specialized behaviors to survive; plus, what life is like for the descendants of the Incas.

Dylan Dreyer explores the Amazon River Islands in the heart of South America; the Amazon and Orinoco Rivers, as well as the rainforest, provide a rich environment for fascinating animals from high-flying squirrel monkeys to slow-moving sloths.

Dylan Dreyer travels to the Zanzibar Archipelago off the coast of East Africa to explore lush beaches and beautiful reefs full of exotic mammals, crustaceans and fish, from small fiddler crabs on Chumbe Island to massive whale sharks.

Dylan Dreyer visits the island chain of the Philippines in Southeast Asia; Palawan Island is home to an array of interesting creatures, including the giant pitcher plant, giant centipedes, and binturongs; tarantulas and scorpions live in local caves.

Dylan Dreyer explores India's Thar Desert, one of the world's biggest deserts; in the thriving city of Jaipur, people share the streets with macaques; deer hogs, peacocks and tigers live in desert grasses; cranes migrate through the desert.

Dylan Dreyer explores South America's Pantanal region, the biggest wetland on Earth; parakeets and parrots make their nests in cliffs and trees; a jaguar and a crocodile engage in an epic showdown; ranchers and their cattle play an important role.

Dylan Dreyer visits Patagonia in South America, where penguins almost outnumber people; beavers build dams that affect woodpeckers and other birds' lives; glaciers and ice fields host a range of creatures, including flamingos, guanacos and pumas.

Dylan Dreyer takes a journey to South America's dense and crowded Amazon rainforest; red howler monkeys, harpy eagles and sloths live in the canopy, while army ants march on the forest floor along with wasps, tadpoles, flies and stick ticks.

Dylan Dreyer visits Venezuela's Orinoco River, one of the longest, largest rivers in the world; a puma uses the river as a hunting ground; four-eyed fish and fiddler crabs make their homes in the river; red howler monkeys hang out in the trees above.

Dylan Dreyer meets exotic creatures in Thailand, including local hog deer, who are targeted by Indochinese tigers; gibbons and macaques live in the canopy of some of the world's oldest trees; creatures on the Kra Isthmus call caves home.

Dylan visits Malaysia, where proboscis monkeys gather food while escaping predators; crocodiles hunt for their next meal; pitcher plants and other wildlife grow on the highest peaks of Malaysian mountains; Malaysian orangutans make their homes.

Dylan explores the lives of the most powerful and elusive creatures on Earth, including moon bears in Cambodia, snub-nosed monkeys in China, king cobras and tigers in the Ghats, wolves in Turkey, gannets in the Hebrides and Sri Lankan leopards.

Dylan Dreyer visits the beautiful, wildlife-diverse Galapagos Islands; Isabela Island houses the flightless cormorant; lava lizards and greater flamingos show off; lava cactus and marine iguanas on Fernandina; frigatebirds thrive on North Seymour.

Dylan Dreyer revisits the diverse landscape of Turkey, where spur-thighed tortoises come out of hibernation; fairy chimneys in Cappadocia provide homes for wild pigeons; sheep thrive in the Anatolian Plateau; Nile turtles dominate the Dalyan Delta.

Dylan Dreyer revisits the Caribbean, where Antillean iguanas, Abolo lizards and more show off their genius for adaptation; ancient volcanoes create fumaroles; polyps form coral reefs; four-eyed fish and spectacled caimans thrive in the Caroni Swamp.

Dylan Dreyer explores the motherhood experience for nurturing gibbons and langurs on the Indochinese peninsula, leatherback sea turtles in the Caribbean, macaques in India and China, elephants in Sri Lanka and sea lions in the Galapagos.

NBC News meteorologist and co-anchor of the Saturday edition of "Today," Dylan Dreyer, helms this celebration of nature, which utilizes beautiful cinematography to create an up-close-and-personal experience with Earth's wild animals -- from polar bears in the Arctic to black bears in Montana. The show's unique platform brings the excitement of seeing creatures in their natural habitats into viewers' homes, where they can explore natural phenomena -- including the migration of 1.5 million animals across 500 miles of Africa -- they may otherwise never have the chance to experience.

Jack Hanna has hosted TV shows about wildlife since the premiere of "Jack Hanna's Animal Adventures" in 1993 and has become a zoological authority in his 30-plus years working at the Columbus Zoo and Aquarium in Ohio. On "Wild Countdown," he uses his knowledge and experience to present count-down lists of rare, fascinating creatures -- appropriate, given Hanna's many appearances on "Late Show With David Letterman." Topics include beasts equipped with armor, deceptively cute -- but dangerous -- animals, and adorable baby critters.