Walking with Monsters – Life Before Dinosaurs, marketed as Before the Dinosaurs – Walking with Monsters in North America, is a 2005 three-part nature documentary television miniseries created by Impossible Pictures and produced by the BBC Studios Science Unit, the Discovery Channel, ProSieben and France 3. Walking with Monsters explores life in the Paleozoic era, showcasing the early development of groups such as arthropods, fish, amphibians, reptiles and synapsids.