T rex’s direct ancestor crossed from Asia to North America by ScienceVega | May 8, 2025 | Earth ScienceThe end Cretaceous Northern Hemisphere fauna was dominated by Tyrannosaurids (such as Tyrannosaurus rex), hadrosaurs and ceratopsian ornithischian dinosaurs. Credit: Pedro Salas and Sergey Krasovskiy. CC BY-SA. Tyrannosaurus rex evolved in North...
