According to recent paleohistological study on 2 tyrannosaurid specimens, Jane and Petey, it has been determined that they are not adult Nanotyrannus, but much more likely to be juvenile T.rex.
SciencyDaily article here.
Actual journal article from Science Advances here.
As well, it looks like T.rex could control its growth rate in proportional to how bountiful prey was. Cool, right?!
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