I have verified the claim against the underlying peer-reviewed study and primary institutional sources. VERDICT: TRUE **What the claim says vs. what the primary sources establish** The viral claim — "The first ever sequence of footprints made by an adult T-Rex was discovered in North Dakota" — matches the peer-reviewed finding, with one scientific caveat (the trackmaker is identified as *most likely* an adult *T. rex*, not proven beyond doubt). **Primary source 1 — the peer-reviewed study (journal domain)** Falkingham, Hups, Tamez‑Galvan, Bercovici & Lyson (2026), *Journal of Vertebrate Paleontology*, DOI 10.1080/02724634.2026.2706201 — [tandfonline.com full article](https://www.tandfonline.com/doi/full/10.1080/02724634.2026.2706201) - Finding: The paper describes a "newly discovered ∼7 m trackway comprised of four large tridactyl tracks, each ∼1 m in length, from the Upper Cretaceous Hell Creek Formation of **North Dakota**," dated ~66.5 Ma. - Finding: It concludes the size/shape "is consistent with an adult *Tyrannosaurus rex* trackmaker" and explicitly states this "marks the **first report of a trackway that is likely attributable to an adult Tyrannosaurus rex**." **Primary source 2 — university repository record of the same study (university domain)** Liverpool John Moores University Research Online — [researchonline.ljmu.ac.uk/id/eprint/29394](https://researchonline.ljmu.ac.uk/id/eprint/29394/) - Finding: Confirms the accepted manuscript and full abstract of the study, host institution LJMU, and states "this is an important data point that marks the first report of a trackway that is likely attributable to an adult *Tyrannosaurus rex*." **Primary source 3 — the research institution's own page (museum/research domain, independent of the journal)** Denver Museum of Nature & Science, "T. rex Trackway" — [dmns.org/science/research/t-rex-trackway](https://www.dmns.org/science/research/t-rex-trackway/) - Finding: It states scientists "discovered the **first adult T. rex trackway**," found in 2025 on "federal land administered by the **U.S. Forest Service near Marmarth, North Dakota**," recording two left and two right footprints with a stride of ~13 ft and a walking speed of ~3.5–4.5 mph. **Additional institutional corroboration** Liverpool John Moores University news release — [ljmu.ac.uk/about-us/news/articles/2026/9/8/new-insights-into-how-the-t-rex-moved](https://www.ljmu.ac.uk/about-us/news/articles/2026/9/8/new-insights-into-how-the-t-rex-moved) — describes the find as "the first adult T. rex trackway," found in the Hell Creek Formation of southwestern North Dakota. **Caveats worth noting** - The identification is a probabilistic attribution: sources say *T. rex* is the "most likely"/"likely" trackmaker based on footprint size, toe shape, and the abundance of local *T. rex* fossils — because the track surfaces are "heavily fractured" and "retain little anatomical detail." - It is the first *trackway* (a sequence of multiple prints). Isolated single footprints previously attributed to adult *T. rex* have been reported elsewhere, so the novelty is the multi-step sequence, not the existence of any adult *T. rex* print. - I could not locate a dedicated U.S. Forest Service / government web page about this discovery; the land-manager detail comes from the museum and journal/publisher sources above. Sources opened: [tandfonline.com/doi/full/10.1080/02724634.2026.2706201](https://www.tandfonline.com/doi/full/10.1080/02724634.2026.2706201) · [researchonline.ljmu.ac.uk/id/eprint/29394](https://researchonline.ljmu.ac.uk/id/eprint/29394/) · [dmns.org/science/research/t-rex-trackway](https://www.dmns.org/science/research/t-rex-trackway/) · [ljmu.ac.uk…new-insights-into-how-the-t-rex-moved](https://www.ljmu.ac.uk/about-us/news/articles/2026/9/8/new-insights-into-how-the-t-rex-moved) · [newsroom.taylorandfrancisgroup.com…first-ever-trackway-of-adult-t-rex-discovered](https://newsroom.taylorandfrancisgroup.com/first-ever-trackway-of-adult-t-rex-discovered/)