Walking with dinosaurs: Mystery of Pachyrhinosaurus mass grave in Canada

A group of researchers have come to Pipestone Creek in Canada to figure out why thousands of dinosaurs are buried here.

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Thousands of dinosaurs were buried here, killed in an instant on a day of utter devastation.

Now, a group of palaeontologists have come to Pipestone Creek - appropriately nicknamed the "River of Death" - to help solve a 72-million-year-old enigma: how did they die?

Trying to work out exactly what happened here starts with the hefty strike of a sledgehammer.

Brute force is needed to crack open the thick layer of rock that covers what Professor Emily Bamforth, who's leading the dig, describes as "palaeo gold".