A groundbreaking revelation by University of Alberta researchers suggests that a raptor dinosaur may have preyed on a significantly larger tyrannosaur.
The discovery of bite marks on the jaw of an Albertosaurus, a close relative of the famed Tyrannosaurus rex, sheds light on an intriguing scenario that unfolded in Alberta around 70 million years ago.
The fossil, belonging to an eight-year-old Albertosaurus that had not yet reached full maturity, presented researchers with two conflicting theories regarding the events following its demise near Drumheller, Alta., approximately 130 kilometers northeast of Calgary.
The prevailing belief is that a smaller, two-legged raptor feasted on the larger Albertosaurus after its demise from unknown causes.
Philip Currie, a University of Alberta professor specializing in dinosaur paleobiology, described the rare occurrence as valuable insight into carnivore behavior within the ancient ecosystem.
The finding not only offers a glimpse into the interactions among carnivorous dinosaurs but also adds complexity to our understanding of the prehistoric food chain.
Leading the investigation into the bite marks, Joshua Doyon, a master’s student in paleontology at the U of A, utilized comparative analysis of teeth spacing to identify a raptor as the probable culprit.
An alternative hypothesis suggests that the Albertosaurus may have been cannibalized by a much younger member of its own species, measuring approximately two meters in length and less than two years old.
Discovery Triggers Research Endeavor
The fossil, unearthed in 2022 by a local explorer in the badlands north of Drumheller, was reported to the Royal Tyrrell Museum, leading to the commencement of Doyon’s research project in 2023.
Close-up of the fossils utilized in Doyon’s study. (Scott Neufeld/CBC)
Doyon’s interest in exploring dinosaur behavior and interspecies dynamics led him to investigate a prehistoric feeding interaction through this remarkable specimen.
Currie emphasized the significance of examining minute details on fossils, like tooth marks, to glean insights into dinosaur biology and ecosystem interactions.
These findings could enhance our understanding of predator-prey relationships and species dynamics in ancient environments.
While the Albertosaurus reigned as a top predator, the suspected raptor, likely a dromaeosaur named Atrociraptor, was relatively smaller, resembling the size of a German shepherd.
This discovery stands out for showcasing evidence of one carnivorous dinosaur preying on another, rather than herbivorous prey.
Contrary to the cinematic portrayal of raptors, the real-life counterparts found in Alberta, such as Atrociraptor, were notably smaller than their Hollywood depictions.
Doyon hopes that both paleontologists and amateur fossil hunters will pay closer attention to subtle tooth marks on bones, potentially revealing hidden clues about ancient interactions.
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