Presents a selection of prehistoric animals of the early Cretaceous period, and describes what they may have eaten, how they cared for their young, and which animals may have had feathers instead of scales.

In 2002, the discovery of a beautiful and bizarre fossil astonished scientists and reignited the debate over the origin of flight. With four wings and superbly preserved feathers, the 130 million-year-old creature was like nothing paleontologists had ever seen before. In this program, Nova travels to the Chinese stone quarry where the fossil was discovered - a famed fossil treasure-trove - and teams up with the world's leading figures in paleontology,...