For years, paleontologists have used fossils of what were thought to be juvenile T. rex to model the growth and behavior of the “tyrant lizard king.” However, this practice is rooted in some controversy,

How did these different dinosaur species interact? Did they hunt different prey? What did T. rex adolescence really look like?

For decades, paleontologists debated whether fossils were of a young T. rex or a species called nanotyrannus. A new study settles it: Nanotyrannus is real.

A fossil of two dinosaurs locked in battle shows the smaller of the pair wasn’t a young T. rex but a full-grown predator of its own species