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Walking with dinosaurs: Mystery of Pachyrhinosaurus mass grave in Canada

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75% Informative

Thousands of fossils have been collected from a mass grave in Alberta , Canada .

The bones belong to a dinosaur called Pachyrhinosaurus , a relative of the Triceratops .

Palaeontologists have excavated an area the size of a tennis court, but the bed of bones extends for a kilometre into the hillside.

Prof Bamforth says the Pachyrhinosaurus wouldn't have stood a chance in a sudden flood.

He says the animals are not able to move very fast because of their sheer numbers, and they're not very good at swimming at all.

The new series of Walking With Dinosaurs starts on Sunday 25 May at 18:25 BST on BBC One .