Lost Worlds, Vanished Lives is a four-part BBC documentary series concerning the discovery of fossils. It is written and presented by Sir David Attenborough and was originally broadcast in April 1989.

In this particular episode, RT 39:23, viewers examine how paleontologists use fossil remains and dinosaur footprints to reconstruct the animals that left them behind.

Attenborough uses paleontological evidence to reconstruct the daily lives of dinosaurs and give viewers a sense of what life was like on Earth some millions of years ago. Also, Attenborough offers viewers an up-close look at the frontiers of this science, showing how scientists use the evidence they have to reconstruct a model of this lost world.