Meet Mara, an endearing lion cub striving to be like her mother; Sita, a cheetah and single mother of five; and Fang, a proud leader of the pride who must defend his family from a rival lion.

Athena is a mother who will do everything in her power to protect her herd when they are forced to leave their waterhole. This epic journey, narrated by Chiwetel Ejiofor, takes audiences across the African savannah, and into the heart of an elephant family. A tale of love, loss and coming home.

Life is an adventure for a young monkey and her son, living among ancient ruins in the jungle. But when her family is forced from their home, she must lead them to safety amidst strange new creatures and surroundings.

Fifty years ago there were close to half-a-million lions in Africa. Today there are around 20,000. To make matters worse, lions, unlike elephants, which are far more numerous, have virtually no protection under government mandate or through international accords. This is the jumping-off point for a disturbing, well-researched and beautifully made cri de coeur from husband and wife team Dereck and Beverly Joubert, award-winning filmmakers from Botswana who have been Explorers-in-Residence at National Geographic for more than four years. Pointing to poaching as a primary threat while noting the lion's pride of place on the list for eco-tourists-an industry that brings in 200 billion dollars per year worldwide-the Jouberts build a solid case for both the moral duty we have to protect lions (as well as other threatened big cats, tigers among them) and the economic sense such protection would make. And when one takes into account the fact that big cats are at the very top of the food chain-and that their elimination would wreak havoc on all species below them, causing a complete ecosystem collapse-the need takes on a supreme urgency.

From BBC Earth Films, the studio that brought you Earth, comes the sequel - Earth: One Amazing Day, an astonishing journey revealing the awesome power of the natural world. Over the course of one single day, we track the sun from the highest mountains to the remotest islands to exotic jungles. Breakthroughs in filmmaking technology bring you up close with a cast of unforgettable characters. Told with humour, intimacy and a jaw-dropping sense of cinematic splendour, Earth: One Amazing Day highlights how every day is filled with more wonders than you can possibly imagine- until now.

Documentarian John Chester and his wife Molly work to develop a sustainable farm on 200 acres outside of Los Angeles.

A devastating and heart-rending take on grizzly bear activists Timothy Treadwell and Amie Huguenard, who were killed in October of 2003 while living among grizzly bears in Alaska.