In southern India, the summer is a challenge for Asian elephants who must drink every day; as things dry up, Anura, the matriarch, leads her herd to a distant watering hole.

A female king cobra searches for a mate, food and a spot to lay her eggs before the monsoon arrives.

Nestled on the edge of the ancient city of Jodhpur, the luxurious Temple Gardens are home to a huge troop of Hanuman Langurs, who enjoy a peaceful life of bounty; the troop has a strict hierarchy.

Rajan is the powerful alpha male who sits at the head of an unusually large troop; he has done well to sustain such a big group, but the future doesn't look so bright; there are more mouths to feed, and yet his jungle home is shrinking.

A young lion cub must survive as his family is torn apart; two adolescent leopard cubs must fend for themselves after they are abandoned; a young adult blackbuck must risk life and limb as he tries to secure his first mating.

In the grasslands of northeast India, an adult female one-horned rhino teaches her new calf.

Hoolock gibbons live the high life in the rainforests of northeast India, leaping through the trees in search of the perfect meal.

An old stallion in India's Ladakh plateau finds a way to stay ahead of his rivals.

A mother tiger must provide enough food for her family to stay alive.

A female sloth bear with two cubs searches for food and protects her cubs from leopards in the midst of the summer heat and tropical storms.

Adventurer/survivalist Bear Grylls hosts and narrates this six-part docuseries, which draws attention to the volatility of Mother Nature and the resilient animals that survive Earth's most extreme habitats. Each hourlong episode characterizes one of the planet's roughest environments -- including jungles, mountains, deserts, oceans, the poles and grasslands -- and how each of its inhabitants acclimate to its turn of events. As Grylls guides viewers through these extreme locations, the incredible ways in which animals have adapted to survive against all odds are celebrated. As well, underscored is a sense of urgency to the effects of climate change.

Veteran broadcaster David Attenborough presents a wildlife series focusing on the natural history of Singapore. Once covered in lush, tropical rainforests, the island city-state has seen increased urbanization across its 63 islands which have pushed the wildlife to adaptation or retreat to the remaining nature reserves. Viewers follow the meditative voice of Attenborough's narration as they witness fascinating creatures such as the flying colugo or the endangered pangolin surviving in the remaining nature preserves. From feisty pistol shrimp along the shores to cat-like civets on the rooftops of city buildings, Singapore is teeming with wildlife hotspots ready to be explored.

Madagascar is a land just off the coast of Africa that is full of misty mountains, tropical rainforests and spiny desert scrub. It is also home to strange wildlife, much of which is not found elsewhere on Earth. This documentary series, from the BBC's Natural History Unit, showcases the island's diverse and rare wildlife, some of it being filmed for the first time. Among the animals featured on "Madagascar" are lemurs, frogs that change color from brown to yellow, wasps that pluck tadpoles from trees and fish that swim upside down. David Attenborough narrates the three-part series.

The wilds of the world have always been magnificent and those of Africa are no exception. These tall giants provide shade in the blistering heat and shelter to animals desperate to escape the scorching heat. They provide haven to herbivores and predators alike -- these are the miracle trees of Africa and include the sausage tree of Zambia, the marula of the Manyeleti, and the camel thorn of the Kalahari. All of these have uniquely evolved to their environments and Africa's extremes, each hosts a haven for the varying animals of the savannas.

Actor James Norton narrates a series exploring America's iconic Wild West, known for its legends and synonymous with Hollywood productions. Miles of desert landscapes, redwood forests and extreme coastlines make up the topography, shaping the lives of the wildlife and inhabitants of the area. Filmed over a two-year period, the camerapeople use the latest technology to capture the location from land, air and sea. Episodes discover the animals and plants that have adapted to life on the sand dunes, including mustangs, coyotes, desert tortoises and cacti.

Narrated by Tom Selleck and featuring Bon Jovi's "Army of One" as its theme song, the sweeping seven-part documentary "North America" captures a land where life collides with hostile, untamed wilderness in one of the most diverse, deadly environments on Earth. The series, which took more than three years to produce, includes stories of animals struggling to survive unforgiving weather and rugged terrain, from the frigid Yukon Territory and the lush forests of Belize to the snow-capped Rockies and barren deserts of the Southwest. A "making of" episode chronicles challenges that the production team encountered, including Hurricane Irene and other natural disasters.