Big head but a simple brain Dimitri Carol / Alamy
Tyrannosaurus rex has a reputation for being one of the biggest and fiercest dinosaurs ever to have lived. But it probably wasn’t the brightest: it had a simpler brain than an earlier, smaller tyrannosaur. The change could be a consequence of growing so large.
Fossils suggest that T. rex could reach 12 metres in length and between 8 and 14 tonnes in weight. It belonged to a family of dinosaurs called the tyrannosaurs – but not all of them were large. For example, Dilong paradoxus – which lived 50…
