The Shift in Prehistoric Apex Predators ? Dinosaur Cold Case | Smithsonian Channel
At the end of the Cretaceous period, only one mega-predatory dinosaur ruled North America: Tyrannosaurus Rex. The Borealopelta was alive around the mid-cretaceous era, so eyes turn to one of T-Rex’s ancestors to figure out why it disappeared. #DinosaurColdCase #SmithsonianChannel From Dinosaur Cold Case: https://bit.ly/3kwPBcp Subscribe to The Smithsonian Channel:>>>