Walking with Beasts

Season 0, Episode 1

Episode Title: Triumph of the Beasts

Air Date: 2001-11-21

Overview:

The incredible story of how mammals took over from the dinosaurs as the largest, fastest and fiercest creatures on Earth. The mammals triumph was a roller coaster ride as they faced one of the most turbulent phases in Earth's history. At a time when birds ate horses, the mammals had to fight for their very survival.