Small Raptor Bite Marks on Albertosaurus Skeleton Ignite Debate on Dinosaur Feeding Habits

Recent analysis of fossils uncovered near Drumheller, Alberta, shows bite marks on an Albertosaurus skeleton that may constitute the inaugural record of a diminutive theropod preying on a massive apex predator, or, alternatively, evidence of juvenile tyrannosaurid cannibalism.

Although the fossil was first uncovered in the late 1990s, only a new high‑resolution imaging study has revealed a set of shallow, paired gouges on femur and rib fragments. Scientists point out that the interval and curvature of these scratches correspond to the tooth pattern of dromaeosaurids—small, bird‑like raptors that coexisted with larger carnivores in the Late Cretaceous. Should the marks be attributable to a dromaeosaurid, they would furnish direct proof that such modest predators sometimes scavenged the remains of far larger contemporaries, a behavior previously inferred merely from isolated teeth.

Yet the researchers also entertained a second, more disquieting scenario: the marks might have been made by a juvenile Albertosaurus. Young tyrannosaurids are documented to possess dietary preferences distinct from adults, and some paleontologists propose that cannibalism served as a fallback during food shortages. The dimensions of the gouges are compatible with a sub‑adult bite, and their placement on relatively exposed bone could signal an attempt by a conspecific rather than a diminutive raptor.

Each possibility reshapes our perception of predator‑scavenger interactions in Late Cretaceous habitats. Verifying a dromaeosaurid feeding on an Albertosaurus would highlight the intricate food web of the Belly River Group, where opportunistic scavengers could capitalize on the carcasses of apex hunters. In contrast, proof of juvenile cannibalism would bolster an expanding dataset indicating that tyrannosaurids, akin to many present‑day predators, partook in intraspecific killing and consumption, perhaps to assert dominance or simply to obtain a nutrient‑dense meal.

The results, detailed in a recent preprint and featured by the science news site Phys.org, have sparked requests for additional microscopic examinations and cross‑referencing with bite‑mark databases from other localities. Scientists anticipate that more specimens from the same formation could expose trends that help decide which interpretation is more likely. As the discussion progresses, the Drumheller find serves as a reminder that even extensively studied dinosaurs can still yield unexpected behavioral clues.