The planet is teeming with myriad life forms, both plant and animal, all interlocked in a struggle for survival. As time goes on, some living things are forced to adapt and change to survive. This series chronicles some of the most unusual, if not downright bizarre, behaviors that living organisms have devised to keep their species alive. The 11-episode series was four years in the making, taking camera crews to every continent and habitat.

The nature series "Life Story," a collaboration between BBC and The Open University, shows how animals try to overcome the challenges they face throughout their lives to eventually continue their bloodlines by having offspring. The show, narrated by Sir David Attenborough, aims to give viewers an idea of what it is like for animals who face difficult choices in nature. Episodes document the journey of animals surviving the hazards of being young through learning how to survive as an adult, climbing the social ladder, getting a mate and becoming a parent.

This six-part nature documentary series reveals one of the world's most enigmatic countries -- one filled with natural complexity, picturesque landscapes and colorful people -- all spectacularly captured, from the Himalayas to the tropical islands, using high-definition cameras. The series was filmed for 16 months and involved a half-million miles of travel, with footage being shot in 26 of China's 30 provinces. Topics covered in the series include the climate and terrain of South China, which is ideal for rice cultivation, and the Tibetan Plateau.

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.

A team of wildlife experts and specialist camera crews look at the creatures that go bump in the night.

The most dramatic wildlife spectacles on the planet.

Exploring locations that feature some of the most spectacular seasonal changes in the world, with a look at the processes that cause the changes to occur and how the local wildlife adapts to the changing conditions.

David Attenborough journeys across the polar regions of our planet.

Whenever documentary filmmakers at Discovery Channel and the BBC unite for a project, stellar television seems to follow. "Planet Earth: Africa" stems from this collaboration, as did the breakthrough natural history series "Life" in 2009. David Attenborough narrated that one, and he's back to take viewers on a journey through the vast and diverse continent of Africa. Four years in the making, during which more than 2,000 hours of video were shot, the program consists of six hour-long episodes that feature an array of never-before-filmed species, animal behaviors and previously unknown places. Cameras uncover the extreme dangers of the Kalahari, the dense forests and snow-capped peaks of the Savannah, the dynamic Congo rainforest, the ever-changing climate of the Cape and the massive and parched Sahara.

"Planet Earth: South Pacific" is a six-part British nature documentary that surveys the natural history of the islands of the South Pacific regions including many spots in New Zealand. The program documents the natural history of the region, the South Pacific spans from the Hawaiian Islands to New Zealand and can be home to a variety of animal life and plant life. Viewers can see in depth looks at how the remote islands were colonized, see rare footage of an underwater volcano erupting, and the varying ecological niches. Hosted by Benedict Cumberbatch.