Summary:
- Researchers have identified the first known fossils of juvenile Tyrannosaurus rex, providing critical insights into the growth stages of this apex predator.
- The discovery helps settle a long-standing paleontological debate regarding whether certain small tyrannosaur fossils belonged to a distinct species (Nanotyrannus) or were simply young T. rex specimens.
- Analysis of bone histology confirms that these specimens were indeed immature, indicating that T. rex underwent significant physiological changes as it matured into adulthood.