CARLOS GOLDIN / SCIENCE PHOTO LIBRARY CARLOS GOLDIN / SCIENCE PHOTO LIBRARY
Argentinosaurus dinosaur bone. A fossil bone from Argentinosaurus huinculensis, the biggest dinosaur discovered to date. Below it is an impression in the ground where the bone was embedded. Argentino- saurus has been excavated since the late 1980s at Plaza Huincul, Argentina, by palaeontologists Rodolfo Coria and Jose Bonaparte. Although only fragments of the 100-million-year-old skeleton have been found, comparisons with similar fossils suggest the animal may have weighed up to 100 tonnes. At only 30 metres from head to tail, how- ever, it was not the longest dinosaur. The animal probably lived half immersed in water to support its colossal weight. Photographed in 1995.
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