10 Most Terrifying Prehistoric Predators That Once Ruled North America

Subscribe to Primal Killers for weekly deep dives into nature's deadliest predators, past and present →    / @primalkillers_1   You know the wolf, the grizzly, the mountain lion. Now meet the ten predators that ruled this same ground before any of them existed — going back almost 300 million years. From a sail-backed hunter that predates the dinosaurs, through the Age of Dinosaurs itself, straight into the Ice Age and beyond — these are the apex predators that actually ruled North America, in the exact order they ruled it. Every fact in this video is checked against current research, including a few "well-known" claims that turned out to be outdated or just plain wrong.