Argentinosaurus dinosaur site. Palaeontologists dig for bones of Argentinosaurus huinculensis, the biggest dinosaur discovered to date, at an excava- tion site at Plaza Huincul, Argentina. Argentino- saurus has been excavated here since the late 1980s by Rodolfo Coria (in the middle) and Jose Bonaparte. Although only fragments of the 100- million-year-old skeleton have been found, compar- isons with similar fossils suggest the animal may have weighed 80-100 tonnes. At only 30 metres from head to tail, however, it was not the longest dinosaur. Argentinosaurus was a sauropod, a long-necked vegetarian that lived half under water to support its colossal weight.

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