Millions of years ago, Earth looked very different. All the continents were fused into one, teeming with life that was both beautiful and terrifying. When you think of prehistoric times, you might picture a T. rex rampaging through the jungle with its razor-sharp teeth. But even before the dinosaurs, there were other giant creatures ruling the Earth. 00:00 What Was Earth Like Before the Dinosaurs? 01:54 299 Million Years Ago 02:50 290 Million Years Ago 04:53 273 Million Years Ago 06:07 260 Million Years Ago 07:24 252 Million Years Ago Questions or concerns? Contact us at underknown.com/contact Interested in sponsoring our episodes or collaborating? Email us: inquiries@underknown.com Get our 100 best episodes in one mind-blowing book: bit.ly/ytc-the-what-if-100-book Join this channel to get access to perks: youtube.com/channel/UCphTF9wHwhCt-BzIq-s4V-g/join Check out our other channels: How to Survive: bit.ly/how-to-survive-show Aperture: ht...