The era of the sabretooth and many other Pleistocene creatures comes to an end. The biggest big cats ever, the lion and the tiger, become the kings of their respective habitats - but they had to fight for their place. To survive, these great cats target larger and more challenging prey.

What changes has the Earth has undergone through the eyes of the puma and leopard? From the almost complete disappearance of American wildlife to the rise of man and the industrialized and urban areas of the modern 21st century. Big cats face numerous threats to their survival.