Fossilised bones of a dinosaur believed to be the largest creature ever to walk the Earth have been unearthed in Argentina, palaeontologists say.
Based on its huge thigh bones, it was 40m (130ft) long and 20m (65ft) tall.
Weighing in at 77 tonnes, it was as heavy as 14 African elephants, and seven tonnes heavier than the previous record holder, Argentinosaurus.
Scientists believe it is a new species of titanosaur – an enormous herbivore dating from the Late Cretaceous period.
A local farm worker first stumbled on the remains in the desert near La Flecha, about 250km (135 miles) west of Trelew, Patagonia.
The fossils were then excavated by a team of palaeontologists from the Museum of Palaeontology Egidio Feruglio, led by Dr Jose Luis Carballido and Dr Diego Pol.
They unearthed the partial skeletons of seven individuals – about 150 bones in total – all in "remarkable condition".
A film crew from the BBC Natural History Unit was there to capture the moment the scientists realised exactly how big their discovery was.
By measuring the length and circumference of the largest femur (thigh bone), they calculated the animal weighed 77 tonnes.
"Given the size of these bones, which surpass any of the previously known giant animals, the new dinosaur is the largest animal known that walked on Earth," the researchers told BBC News.
"Its length, from its head to the tip of its tail, was 40m.
"Standing with its neck up, it was about 20m high – equal to a seven-storey building."
This giant herbivore lived in the forests of Patagonia between 95 and 100 million years ago, based on the age of the rocks in which its bones were found.
But despite its magnitude, it does not yet have a name.
Written By: James Morgan
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