Albertosaurus libratus adult and youngster? Or two species? Drawn to the same scale, note that the smaller individual's teeth, which are partly covered by the lips, are absolutely larger than the bigger one's. On the side of the lower jaw, the bulge of the surangular bone typical of tyrannosaurs can clearly be seen. in Predatory Dinosaurs of the World

Albertosaurus libratus adult and youngster? Or two species? Drawn to the same scale, note that the smaller individual's teeth, which are partly covered by the lips, are absolutely larger than the bigger one's. On the side of the lower jaw, the bulge of the surangular bone typical of tyrannosaurs can clearly be seen.