Narrator: The giant carnivore has killed the dominant female. It is a bitter blow; winter is coming, and without a lead female there will be tension in the clan.
Narrator: Dawn over a silent forest a few hundred miles away from the South Pole. It is the end of months of total darkness, and as the sun's rays filter down through the trees, they reveal a cold harsh world.
Narrator: It is the mid-Cretaceous period, and dinosaurs are now more widespread than ever, reaching every part of the globe. But one place is a special challenge: the South Pole.
Narrator: Life on the Poles is a remarkable evolutionary achievement for the dinosaurs. But eventually, a slight cooling in the world's climates will spell the end of these lush forests. And without them, these unique dinosaurs will also disappear.