As the snow melts, the extent of Yellowstone is revealed. Grizzly bears teach their young how to hunt fish and move out through valleys and grasslands.
From deep in the undergrowth to the highest tree, forests are home to two-thirds of all species, mammals have overcome challenges of life in a crowded world.
From baking deserts, forests and even raging bush fires, mammals use their ingenuity, incredible intelligence and remarkable resilience to beat the heat.
From freshwater ponds to the depths of the open ocean, air breathing mammals have found remarkable ways to overcome the many challenges of a life in water.
With heightened senses verging on superpowers, over two thirds of mammal species are nocturnal creatures of the night as their daytime world gets more crowded.
Naturalist David Attenborough reveals how the continent is changing more rapidly than any time in history and highlights the new challenges animals will face.
The vibrant rainforest is home to more than one-fourth of the continent's mammals, but living there is far from easy as they must battle for everything.
East Africa is filled with forests, snowy peaks, swamps, savannahs and the largest population of big mammals, forcing the creatures to takes risks to survive.
The United States-sized desert is explored, revealing large sandstorms, drought-ridden regions, ants that can withstand the mid-day sun, sand dunes, and more.
Two diverse and mysterious landscapes at the southern tip, which are home to a variety of animals and created by two great ocean currents, are examined.
Clever meerkats encounter an even smarter bird; black rhinos meet for a surprisingly social gathering; aggressive giraffes fight over the limited resources.
After a run-in with witches in their early years, a pair of sibling bounty hunters work together to track down and kill witches from all around the world.
Humanity desperately makes plans to prevent possible extinction as a newly discovered comet journeys along a collision path leading straight toward Earth.
When Sir David Attenborough was in his mid-eighties, many thought he had retired, but in reality, he was revisiting iconic landscapes across the globe.