New species of dinosaur discovered that 'rewrites' T.rex family tree

Discoveries of new dinosaur species like Khankhuuluu mongoliensis are rewriting the evolutionary history of tyrannosaurs, the iconic group that includes T.rex. This 86 million-year-old species is believed to be the closest known ancestor of all tyrannosaurs, showing an evolutionary shift from small predators to the mighty giants. The research, published in Nature, sheds light on how tyrannosaurs evolved into powerful predators that dominated North America and Asia during the dinosaur era.