CARLOS GOLDIN / SCIENCE PHOTO LIBRARY CARLOS GOLDIN / SCIENCE PHOTO LIBRARY
Giganotosaurus carolinii jawbone. The fossilized upper jaw and teeth of the largest carnivorous dinosaur discovered to date. The tape measure shows the scale in centimetres. Bigger even than Tyrannosaurus rex, Giganotosaurus may have been the largest meat-eater to walk the Earth. Its 110- million-year-old bones were found in 1993 at El Chocon, Argentina, by palaeontologists Jose Bonaparte, Rodolfo Coria and Leonardo Salgado. Among the fragments were an upper jawbone and a thigh bone, both longer than matching bones in the biggest T. rex. The new species is thought to be part of the same general lineage as Tyrannosaurus. Photographed in 1995.
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