Changes the planet has undergone affects big cats, from the almost complete disappearance of American wildlife to the rise of man; threats to big cats' survival.

The era of the sabretooth is over and the biggest big cats ever, the lion and the tiger, become the kings of their respective habitats.

Saber-tooths rule the Pleistocene Era but the arrival of the new cats, early snow leopards, cheetahs and jaguars, mark a turning point in the evolutionary track.

As big cat populations shrink fast, it's now possible to view them in more detail than ever.

Deadly showdowns in the wilds of Southern Africa between big cats like lions, cheetahs and leopards, and jackals, wild dogs and hyenas.

Many years of selective breeding allow people to mold dogs to serve as laborers, companions and warriors.

The naturalist, broadcaster and writer continues to be intrigued by certain animals, despite a lifelong career of wildlife filmmaking. In "David Attenborough's Natural Curiosities," he highlights some of nature's evolutionary anomalies and how curious critters baffle and fascinate scientists. Each episode features two animals, linked by a common theme, who adapt to their environments in unusual ways. Filmed throughout the U.K., stories of nature turning the ordinary into the extraordinary are showcased with Attenborough's storytelling and amazing images of the animals.

Revealing the extraordinary wildlife stories and unseen wilderness of Earth's seven continents.