Seventy-two million years ago in Alberta, Canada thousands of dinosaurs were killed by one devastating event. The mass grave is hidden beneath the slopes of a lush forest and nicknamed the "River of Death".

Seventy-two million years ago in Alberta, Canada thousands of dinosaurs were killed by one devastating event. The mass grave is hidden beneath the slopes of a lush forest and nicknamed the "River of Death".

Seventy-two million years ago in Alberta, Canada thousands of dinosaurs were killed by one devastating event. The mass grave is hidden beneath the slopes of a lush forest and&nbsp;nicknamed the "River of Death".

Paleontologist Emily Bamforth digs for thousands of dinosaurs in Canada

Smart, in-depth and relentlessly curious, host Kathryn Ryan dives into the stories shaping New Zealand and its people. Interviews and expert analysis from around the world and at home. It’s where big ideas are unpacked and everyday life explored.

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Paleontologist Emily Bamforth digs for thousands of dinosaurs in Canada

Paleontologist Emily Bamforth digs for thousands of dinosaurs in Canada