Nanotyrannus Unmasked: Bloody Mary and the Tale of Two Tyrannosaurs

In this deep dive, we unpack the 2025 study arguing Nanotyrannus is a distinct tyrannosaur, not a juvenile T. rex. Using the extraordinary NCSM 4000 specimen, Bloody Mary, along with osteohistology, spinal fusion data, and tooth counts, we explore what this means for tyrannosaur growth and ecology in the Hell Creek ecosystem—including the tantalizing possibility that Jane could be Nanotyrannus latheas. A major rethink of Late Cretaceous predators and diversity awaits.

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