PBS Terra has a new episode on Youtube.  This one is about the epic migrations of herds of Pachyrhinosaurus and Edmontosaurus to Alaska during Cretaceous summers.

Very few dinosaurs made it as far North as the Arctic Circle. But two of those – Pachyrhinosaurus and Edmontosaurus – undertook an epic migration every year to reach the fertile grounds of the northern latitudes in summertime. This was far from an easy task. Deadly predators lurked nearby looking to pick off weaker members of this giant herd. But thanks to one incredible fossil in particular, with its soft tissue still intact, evidence is starting to suggest that these two dinosaurs were not just coincidental travel companions. In fact, they may well have used their complementary strengths to fend off predators – and possibly even communicated with each other in order to do so.

Walking with Dinosaurs: Unearthed is produced by BBC for PBS Digital Studios. ©BBC 2025. All Rights Reserved.