First full-grown T. rex trackway uncovered in North Dakota badlands

Paleontologists document the first trackway of an adult Tyrannosaurus rex—a 23-foot sequence of four three-toed footprints in the North Dakota badlands dating to about 66.5 million years ago. The animal is inferred to have walked about 3.5–4.5 mph, and the find, discovered in 2025 on U.S. Forest Service land near Marmarth, was described in the Journal of Vertebrate Paleontology. Three of the four prints will be airlifted to the Denver Museum of Nature & Science for study, highlighting movement clues that bones alone can’t reveal and building on evidence that only two adult T. rex footprints had been confirmed previously.