Fossil “coprolites” as wide as 40cm and weighing several kilograms were found in seven massive patches across the Chanares Formation in La Rioja province.
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Some were sausage-like, others pristine ovals, in colours ranging from whitish grey to dark brown-violet.
“There is no doubt who the culprit was,” said Dr Lucas Fiorelli, of Crilar-Conicet, who discovered the dung heaps.
“Only one species could produce such big lumps – and we found their bones littered everywhere at the site.”
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