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Fragments of bone were originally discovered by a Portuguese man in his garden. This could be the largest sauropod dinosaur – a subgroup characterised by their four legs, long neck and tail and herbivorous diet – ever to be found in Europe.

Elisabete Malafaia, a researcher from the University of Lisbon, said: ‘It is not usual to find all the ribs of an animal like this, let alone in this position, maintaining their original anatomical position.