Four-footed fossil record reveals first adult T. rex trackway in North Dakota

Paleontologists report the first trackway of a full-grown Tyrannosaurus rex: four three-toed footprints spanning about 23 feet, dating to roughly 66.5 million years ago in southwestern North Dakota. The prints suggest the animal walked at about 3.5–4.5 mph; the tracks were found in 2025 on U.S. Forest Service land near Marmarth, scanned in 3D, and three of the prints will be airlifted to the Denver Museum for study. The site also yields tyrannosaur bones, including a juvenile nicknamed Teen Rex, helping illuminate T. rex movement at the end of the Cretaceous.