![]() ![]() The researchers said the Gorgosaurus fossil supports the theory that young tyrannosaurs-including the T-Rex-filled a role in the food chain known as "mesopredators", before later growing into apex predators. These kind of drastic dietary changes are not necessarily rare in the animal kingdom-crocodiles and Komodo dragons start out eating insects before switching to rodents and eventually large mammals, Therrien said. This transformation was driven by a change in diet, as the dinosaurs ditched the drumsticks of their youth and started preying on giant plant-eating dinosaurs. Their heads broadened and their teeth thickened into what Therrien called "killer bananas" capable of crunching through huge bones. These youths probably looked more similar to the velociraptors depicted in the movie "Jurassic Park" than the giant T-Rex, Zelenitsky said.īut at roughly 11 years old, as the tyrannosaurs hit their middle-age, their bodies grew almost ten times in size, ending up weighing more than 3,000 kilograms (6,600 pounds). Young tyrannosaurs had slender heads and legs, sharp knife-like teeth for dissecting carcasses, and could probably run quite fast to catch their turkey-like prey. "This fossil is the first solid evidence that tyrannosaurids drastically changed their diet as they grew from teenagers to adults," Zelenitsky said. The discovery also offers a rare clue into how tyrannosaurs grew from one-meter-long at birth to some of the biggest predators to have ever walked the Earth. "This teenage Gorgosaurus seems to have had an appetite for drumsticks," she said. ![]() Study co-author Darla Zelenitsky, a paleontologist at the University of Calgary, told AFP that this particular "fussy eater" used its sharp teeth to carve itself only the legs of the two baby Citipes. They are far smaller than the massive plant-eating dinosaurs that adult tyrannosaurs had been known to eat. What was most surprising, he added, was that the small leg bones sticking out of the tyrannosaur's ribcage belonged to two young, bird-like dinosaurs called Citipes.Ĭitipes are thought to have had feathers, wings and a beak and walk on two feet, somewhat resembling modern-day cassowaries, Therrien said. The study's lead author, Francois Therrien of the Royal Tyrrell Museum, told AFP they were amazed to "discover the remains of the last meal of this young tyrannosaur still preserved in place". But when they got the skeleton back to the lab, the scientists noticed something strange. The fossil was discovered in 2009 at the Dinosaur Provincial Park, east of the Canadian city of Calgary. The Gorgosaurus-which means "dreadful lizard"-was around six years old when it died more than 75 million years ago, according to a new study in the journal Science Advances. The skeleton of the Gorgosaurus, a member of the tyrannosaurid family that also includes the T-Rex, sheds light on how these dinosaurs grew from fairly slender juveniles into gigantic, bone-crushing, apex-predator adults, they added. ![]()
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