Grasslands cover one quarter of all land and support the vast gatherings of wildlife, but to survive here animals must endure the most hostile seasonal changes on the planet. From Asia's bizarre-looking Saiga antelope to the giant anteaters of Brazil, grassland animals have adapted in extraordinary ways to cope with these extremes. In the flooded Okavango, lions take on formidable buffalo in epic battles, on the savannah bee-eaters take advantage of elephants to help catch insects and, on the freezing northern tundra, caribou embark on great migrations shadowed by hungry Arctic wolves.

We may be smart, but we're still discovering animals have countless skills, every bit as impressive. In a world full of unexpected foes, competition is evolution's ultimate driving force. Is the secret behind the incredible diversity of life on earth, and the most extraordinary animal powers.

The fourth episode of the series takes you on an epic journey through time, beginning 252 million years ago, in a world devastated by the greatest mass extinction in history. Discover how, from the ashes of this cataclysm, fungi become the dominant form of life in an almost apocalyptic landscape. Witness the astonishing story of survival and adaptation of the Lystrosaurus, curious ancestors of mammals, who emerge as the unlikely heirs of the Earth and transform into the dominant creatures, only to be eventually dethroned by new giant predators like the Erythrosuchus. The documentary culminates with the impressive era of dinosaurs and how they adapted to a constantly changing world, and the reigns of the plesiosaurs and pterosaurs, rulers of the oceans and the air. Finally, learn how these titans gave way to modern reptiles and current birds, leaving a legacy that endures to this day.
This documentary is a window into the fascinating evolutionary history of our planet, showing the resilience and diversity of life through the ages. Prepare to be amazed, informed, and deeply moved by this spectacular chronicle of life on our planet.