Dinosaurs may have survived predators, but not volcanic pollution. In the shadows of their extinction, small mammals like the didelphodon begin to take over a crumbling world. Subscribe: http://bit.ly/BBCEarthSub #Predators #Tyrannosaurus #WalkingWithDinosaur Watch more: Best of BBC Earth 🌍 https://bit.ly/BestOfBBCEarth Best Animal Fights 🥊 https://bit.ly/BestAnimalFights Videos over 10 minutes ⏰ https://bit.ly/3SHJCEJ Planet Earth III 🌍 https://bit.ly/PlanetEarthIIIPlaylist Frozen Planet II ❄️ https:/bit.ly/FrozenPlanetIIPlaylist Blue Planet II in 4k 🌊 https://bit.ly/BluePlanetII4kPlaylist This clip has been taken from Walking with Dinosaurs 1999. Welcome to BBC EARTH! The world is an amazing place full of stories, beauty and natural wonder. Here you'll find 50 years worth of entertaining and thought-provoking natural history content. Dramatic, rare, and exclusive, nature doesn't get more exciting than this. This is a commercial page from BBC Studios. Service information and feedback: http://bbcworldwide.com/vod-feedback--contact-details.aspx