Walking with giants: first adult T. rex trackway reveals a calm stroll

Researchers describe the first trackway attributed to an adult Tyrannosaurus rex: four large three-toed prints in Hell Creek mud near Marmarth, North Dakota, dating to about 66.5 million years ago. The 23-foot sequence records a 13-foot stride, implying the predator walked at roughly 3.5–4.5 mph—the pace of a brisk human walk. Advanced 3D scans confirm the prints belong to an adult rex, not juveniles or other species, and three of the four prints will be airlifted to the Denver Museum. This rare behavioral snapshot shows a towering carnivore moving calmly rather than sprinting, providing unique insight into T. rex locomotion.