It's an immense plant-eater. It's perhaps 80 to 100 metric tonnes.It's the size of a herd of elephants.It may be that there are dinosaurs even bigger than Argentinosaurus.But at present, that's as big as we know any land-living creature has ever been in the history of life.This life-size replica of Argentinosaurus is being built for the town square in Plaza Huincul.When it's finished, it will stand as tall as a five-storey building.But it wasn't just this dinosaur's size that was out of the ordinary.When scientists analyzed the layers of rock in which the skeleton was found, they discovered something.Argentinosaurus, along with many smaller South American long-necks, had been living at the wrong time.This fact was to prove crucial.Layers of fossil-bearing rock have shown that dinosaurs roamed the planet for 180 million years.Over the course of this time, hundreds of different species dinosaurs evolved and died out.
