Adult T. Rex Trackway Found in North Dakota Badlands

In a landmark discovery for paleontology, researchers have identified the first confirmed trackway of an adult Tyrannosaurus rex in the rugged badlands of North Dakota. The series of massive footprints, dating back approximately 66.5 million years to the Late Cretaceous period, provides unprecedented insight into the locomotion and behavior of the formidable apex predator. The find was made in 2025 near Marmarth, North Dakota.

The trackway consists of four distinct, three-toed prints, each measuring an impressive size indicative of a fully grown Tyrannosaurus rex. Analysis of the spacing between the prints reveals a stride length of roughly 13 feet, suggesting the animal was covering significant ground with each step. Scientists estimate the dinosaur was walking at a leisurely pace of 3.5 to 4.5 miles per hour, a speed comparable to a brisk human walk.

A Glimpse into the Past

Previously, fossilized footprints attributed to juvenile or smaller theropods have been found, but definitive evidence of an adult Tyrannosaurus rex trackway remained elusive. This discovery is particularly significant because it allows paleontologists to study the gait and physical capabilities of a mature specimen. The precise nature of the prints—deeply impressed into ancient soil—indicates the immense weight and powerful musculature of the adult dinosaur. This find could help settle debates about the differing gaits and speeds of juvenile versus adult tyrannosaurs.

Dr. Aris Petroff, lead paleontologist on the project from the Colorado School of Mines, stated, "Finding a trackway of an adult T. rex is a monumental moment. It’s one thing to find isolated bones, but to see the actual path this magnificent creature took millions of years ago gives us a much more dynamic understanding of its life." Petroff explained that the consistent depth and shape of the prints across the trackway suggest a stable, confident stride.

The location in the North Dakota badlands is renowned for its rich fossil deposits, offering a window into prehistoric ecosystems. The area has yielded numerous dinosaur fossils, but this trackway stands out due to its completeness and the unambiguous identification of the species responsible. The geological context suggests the prints were made in soft mud or silt near a body of water, which helped preserve the details of the dinosaur's feet.

The research team is now working on further analyzing the geological strata surrounding the tracks and comparing them with known T. rex skeletal data. This will help refine estimates of the individual dinosaur's size, age, and potentially even its health. The discovery underscores the importance of continued paleontological exploration in regions like North Dakota, where ancient secrets are still buried beneath the surface, waiting to be uncovered by dedicated scientists studying dinosaur fossils.

Understanding how large predators like the Tyrannosaurus rex moved is crucial for reconstructing ancient food webs and environments. This new evidence of a substantial stride length and moderate walking speed suggests that adult T. rexes may have been capable of covering long distances efficiently, possibly for hunting or territorial patrol. The implications extend to theories on their hunting strategies and metabolic rates, areas that have long been subjects of scientific speculation and debate among paleontologists. Further studies on these dinosaur tracks are expected to shed more light on the biomechanics of these ancient giants.