A rib from the largest known Tyrannosaurus rex, named Scotty, has revealed that the dinosaur was in the process of healing from an injury at the time of its death. Scotty was discovered in the Frenchman River Valley in Canada in 1991 and is believed to have been about 13 meters long and weighed around 9 tonnes—making it the largest T. rex ever found. The fossil, which is about 65% complete, was painstakingly recovered over several years, with the final pieces collected in 2014. Scotty's remains show signs of numerous injuries and traumas, including a broken jaw, fractured ribs, and lesions on its vertebrae. However, some of these injuries appear to have been healing, suggesting that Scotty had a remarkable ability to recover from serious damage. This is not uncommon among large predators, as they often face injuries from combat or hunting, but the extent of healing seen in Scotty's bones is particularly notable. One of the most intriguing discoveries came from a fractured rib. Researchers found fossilized soft tissues within the bone, including a network of blood vessels identified using neutron imaging. Soft tissues are rarely preserved in fossils because they typically decay over time. The presence of these vascular structures is significant because it indicates that Scotty’s body was still repairing the fracture when it died. This is the first time such detailed vascular structures associated with fracture repair have been observed in a dinosaur fossil of this size. The findings provide new insights into the biology and resilience of T. rex. They suggest that these massive predators not only endured frequent injuries but also had biological mechanisms to heal from them. This discovery adds to the growing body of evidence that dinosaurs, like modern animals, had complex physiological responses to injury and disease.