Researchers from the University of Alberta have uncovered a fascinating finding suggesting that a raptor dinosaur might have preyed on a much larger tyrannosaur. The discovery was made when examining bite marks on the jaw of an Albertosaurus, a close relative of the well-known Tyrannosaurus rex that lived around 70 million years ago in Alberta.
The fossil in question belonged to an eight-year-old Albertosaurus that had not yet reached full adult size. The presence of the bite marks prompted researchers to consider two distinct possibilities regarding the fate of the dinosaur after its death near Drumheller, Alberta.
According to the researchers, the most plausible scenario is that a smaller, two-legged carnivorous dinosaur known as a raptor fed on the larger Albertosaurus after its demise from unknown causes. This rare instance provides valuable insight into carnivorous dinosaurs’ interactions and the complexity of the ancient food chain.
Philip Currie, a professor of dinosaur paleobiology at the University of Alberta, emphasized the significance of this finding, noting that Albertosaurus was a dominant predator in its era. The discovery sheds light on the dynamics of how carnivorous dinosaurs coexisted and hunted each other in prehistoric times.
The research, led by Joshua Doyon, a paleontology master’s student at the University of Alberta, involved analyzing the spacing between the bite marks and comparing them with the teeth of other carnivorous dinosaurs from the same period. This analysis pointed to the likelihood of a raptor being responsible for the marks.
Alternatively, it was suggested that the Albertosaurus could have been cannibalized by a much younger member of its own species, measuring about two meters in length and less than two years old.
The fossil containing the bite marks was discovered in 2022 by a member of the public exploring the badlands north of Drumheller. The find was reported to the Royal Tyrrell Museum, leading to further examination and the initiation of Doyon’s research project in 2023.
Doyon expressed his interest in studying dinosaur behavior and species interactions, highlighting how details like tooth marks on fossils can offer valuable insights into ancient ecosystems and predator-prey relationships. This finding underscores the importance of exploring such details to enhance our understanding of dinosaur biology beyond mere identification and description.
The research also emphasized the difference in size between the apex predator Albertosaurus and the suspected raptor, with the latter being significantly smaller. This rare evidence of one carnivorous dinosaur feeding on another provides a unique perspective on ancient predator behavior, distinct from the typical prey-predator relationships.
The study serves as a reminder that the depiction of raptors in popular culture, such as in the Jurassic Park films, may not accurately reflect the true size and characteristics of these ancient creatures. Doyon highlighted that the raptors in Drumheller belonged to a group called dromaeosaurs, with the local species, Atrociraptor, being much smaller than its cinematic counterparts.
Moving forward, Doyon hopes that both paleontologists and the public will pay closer attention to small tooth marks on dinosaur fossils, as these details can offer valuable clues about ancient feeding interactions that might otherwise go unnoticed.