A dinosaur fossil found in the Alberta badlands has revealed new details about the diet of young meat-eating tyrannosaurs.
The research, published Friday in the journal Science Advances, is based on a well-preserved Gorgosaurus libratus specimen discovered in 2009 by a technician from the Royal Tyrrell Museum in Drumheller, Alta.
91裸聊视频淲e describe the first tyrannosaur skeleton found with prey items preserved inside the stomach,91裸聊视频� Darla Zelenitsky, an associate professor in the department of earth, energy and environment at the University of Calgary, said in an interview.
91裸聊视频淚t91裸聊视频檚 a juvenile, or teenage, gorgosaurus 91裸聊视频� that had eaten two young and small birdlike dinosaurs called Citipes.91裸聊视频�
Gorgosaurus was a tyrannosaur that lived 75 to 77 million years ago, before the Tyrannosaurus rex, in what is now southern Alberta. The specimen was found in Dinosaur Provincial Park, about 220 kilometres east of Calgary.
The four-metre long tyrannosaur had an estimated weight of 335 kilograms and, based on the research, would have been about five to seven years old when it died.
Zelenitsky said the fossil represents the first solid evidence of the diet of juvenile tyrannosaurs.
91裸聊视频淚t91裸聊视频檚 really an exciting find, because it91裸聊视频檚 unique and very unusual to find something like this, especially so well preserved.91裸聊视频�
Co-author Fran莽ois Therrien, curator of dinosaur palaeoecology at the Royal Tyrrell Museum, said it91裸聊视频檚 an important discovery for several reasons.
91裸聊视频淪keletons of young tyrannosaurs are extremely rare,91裸聊视频� he said. 91裸聊视频淭heir bones are smaller and more fragile, so either they didn91裸聊视频檛 get fossilized back in (the) Cretaceous or they just get destroyed before we actually find them in the badlands.91裸聊视频�
He said a technician noticed some toe bones while the specimen was being cleaned.
91裸聊视频淭he toe bones were definitely too small to belong to the tyrannosaur and they were coming through the rib cage from inside the animal,91裸聊视频� Therrien said.
They decided to prepare the specimen from the inside out and discovered that the bones of the two small dinosaurs were preserved in the stomach area.
91裸聊视频淭hat was truly amazing, because the last meal 91裸聊视频� or in-place stomach contents 91裸聊视频� of a tyrannosaur had never been discovered before, so that was really exciting,91裸聊视频� Therrien said.
The research, he added, took many years because there were so many pieces to put together. That included identifying the bones in the stomach, determining the age of those bones and the tyrannosaur, and figuring out how long the bones had been in the stomach.
Therrien said it shows a change in diet for tyrannosaurs as they matured.
91裸聊视频淔or a long time, we91裸聊视频檝e known that adult and juvenile, or young, tyrannosaurs were very, very different physically.91裸聊视频�
Adult tyrannosaurs, he said, were large animals with massive skulls and robust teeth that fed on plant-eating duckbill and horned dinosaurs, while juveniles were lightly built and athletic with blade-like teeth and long legs.
91裸聊视频淲e suspected that they were hunting something else, but we did not know what. Now this specimen finally shows young tyrannosaurs hunted small and young dinosaurs.91裸聊视频�
Therrien said a transition from juvenile to adult, similar to people going through puberty, likely took place for the tyrannosaur around the age of 11.
Researchers determined that the young dinosaur was quite surgical in how it ate its prey.
91裸聊视频淚t went around and dissected away the back legs, swallowed those whole and basically didn91裸聊视频檛 eat anything else of the carcass,91裸聊视频� said Therrien. 91裸聊视频淚t took the hind legs and nothing else, probably because that was the meatiest part of the animals.91裸聊视频�
Zelenitsky added the young gorgosaurus appeared to be quite a fussy eater.
91裸聊视频淚magine that as a teenager,91裸聊视频� she said with a laugh. 91裸聊视频淭his gorgosaurus had an appetite for Citipes drumsticks, I guess.91裸聊视频�
The research showed it had eaten the two birdlike dinosaurs in separate feeding events.
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