In 2012, a shepherd uncovered a bone belonging to a new species of dinosaur on a ranch in Patagonia, in Argentina.

A team from the Museum of Paleontology Egidio Feruglio found more than 150 bones, belonging to six skeletons.

The Patagotitan, a type of titanosaur, was 40 metres long, 20 metres tall and weighed 77 tonnes.

Rachel Naylor spoke to Dr Diego Pol, a palaeontologist who led the dig.

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(Photo: The skeleton of the Patagotitan on display in London in 2023. Credit: Dan Kitwood/Getty Images)