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Infernogallus jamesi, nicknamed 'hell chicken', weighed 12kg and measured 1.5 metres long.
It is the first dinosaur known to have specialised specifically in eating fruit.
The toothless creature used specialised jaw muscles and beak ridges to mash soft foods like modern parrots.
Fossils were uncovered in Montana and North Dakota by researchers from Stony Brook University, the Royal Ontario Museum, and the North Dakota Geological Survey.
Findings published in the journal Nature reveal greater dietary diversity in the Cretaceous era than previously understood.
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