Researchers from the University of Alberta have uncovered a startling revelation suggesting that a raptor dinosaur might have feasted on a larger tyrannosaur. The discovery was made based on bite marks found on the jaw of an Albertosaurus, a close relative of the well-known Tyrannosaurus rex, which inhabited Alberta approximately 70 million years ago.
The fossil in question belonged to an eight-year-old Albertosaurus, categorized as a sub-adult that had not yet reached full maturity. The presence of the bite marks prompted researchers to consider two divergent scenarios regarding the fate of the dinosaur after its demise near Drumheller, Alberta.
According to the researchers, the most plausible explanation is that a raptor, a smaller carnivorous dinosaur with two legs, scavenged on the larger Albertosaurus after its death from unknown causes. This rare instance provides valuable insights into carnivorous dinosaur behavior, shedding light on the dynamics of the prehistoric food chain.
Philip Currie, a professor of dinosaur paleobiology at the University of Alberta, emphasized the significance of this finding, highlighting the dominance of the Albertosaurus as a predator during its era. By analyzing the spacing between the bite marks and comparing them with the teeth of contemporary carnivorous dinosaurs, researchers deduced that a raptor was likely responsible for the feeding activity.
Alternatively, there is a hypothesis suggesting that the Albertosaurus was cannibalized by a much younger member of its own species, estimated to be less than two years old and around two meters in length.
The discovery of the fossil in 2022 by a member of the public exploring the badlands north of Drumheller led to its collection and preparation by the Royal Tyrrell Museum. Subsequent examination of the tooth marks as the fossil was reconstructed unveiled the opportunity for a research project initiated by Joshua Doyon, a master’s student in paleontology at the University of Alberta.
Doyon’s interest in studying dinosaur behavior and interspecies interactions prompted his investigation into this ancient feeding interaction. The details revealed by the tooth marks on the fossil provide a unique avenue for paleontologists to gain a deeper understanding of dinosaur biology and ecosystem interactions in prehistoric times.
The findings are particularly noteworthy as they offer rare evidence of one carnivorous dinosaur preying on another, diverging from the conventional notion of carnivores targeting herbivorous prey. The study underlines the importance of scrutinizing fossils for intricate details that can unveil crucial insights into ancient ecosystems and predator-prey relationships.
Albertosaurus, as an apex predator in its environment, contrasted with the smaller suspected raptor, which was approximately the size of a German shepherd. This discovery challenges popular perceptions of raptors influenced by media depictions, emphasizing the reality of the smaller scale of these dinosaurs compared to their cinematic portrayals.
Doyon expressed hope that both paleontologists and individuals discovering dinosaur fossils will pay closer attention to subtle tooth marks, which could hold significant clues often overlooked in the past.