A gigantic "communal latrine" created at the dawn of the dinosaurs has been unearthed in Argentina.
Thousands of fossilised poos left by rhino-like megaherbivores were found clustered together, scientists say.
The 240-million-year-old site is the "world's oldest public toilet" and the first evidence that ancient reptiles shared collective dumping grounds.
The dung contains clues to prehistoric diet, disease and vegetation says a study in Scientific Reports
"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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