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.
Eye-witness accounts brought to life by archive. Witness History is for those fascinated by the past. We take you to the events that have shaped our world through the eyes of the people who were there.
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(Photo: The skeleton of the Patagotitan on display in London in 2023. Credit: Dan Kitwood/Getty Images)
