Dinosaur Metabolism Warm-Blooded Dinosaurs Climate Change Bird-Dinosaur Relationship Body Temperature Regulation Feathered Skin Ecological Role of Dinosaurs Sauropodomorph Evolution Fossil Records Theropod Family Ankylosaurs Tyrannosaurs Megaraptors
New research integrates fossil records, evolutionary modeling, and climate data to trace the migration and growth of T. rex ancestors into North America 70 million years ago.