Classification: Reptiles, saurichsia

Body length: 5 m

Body weight: 450 kg

Epoch: Late Cretaceous

Locations: North America

It could be that nanotyrannus is a juvenile tyrannosaurus. Nanotyrannus is the smallest-known tyrannosaurid and was one of the last tyrannosaurids that lived before the Extinction event of the Cretaceous period.

The majority of palaeontologists are convinced that the scull belongs to a juvenile Tyrannosaurus Rex, although there are slight differences between these two species. Nanotyrannus has more teeth and some bones are interconnected, which was not found on a Tyrannosaurus.