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This is the best summary I could come up with:
The discovery offers new hints about how tyrannosaurs' behaviour and their role in ecosystems changed as they grew, say the Canadian researchers who led their study, published Friday in Science Advances.
And in fact, the meals themselves — the legs of two juvenile bird-like dinosaurs called Citipes elegans — were also an exceptional find, said Francois Therrien, a Canadian paleontologist who co-led the study.
About 75 million years ago, during the Late Cretaceous, the badlands of Alberta were a subtropical coastal plain on the western shore of an inland sea that divided North America.
So there was a lot of excitement when Darren Tanke, a technician from the Royal Tyrrell Museum in Drumheller, Alta., spotted the bones of a young tyrannosaur sticking out of the ground in Dinosaur Provincial Park in 2009.
Peterson had previously found bite marks from a young Tyrannosaurus rex, a few years older than the gorgosaurus in the new study, on the bones of duck-billed dinosaur, a large hadrosaur.
He added that while individual studies don't offer much more than neat stories, "when you get enough of them together like this … you can start putting together a much more comprehensive picture of what the world was like back then, how these animals were interacting," he said.
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