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He collaborated with Darla Zelenitsky and Jared Voris of the University of Calgary, as well as Kohei Tanaka of the University of Tsukuba in Japan. For the study, published this week in the Canadian Journal of Earth Sciences, the researchers examined the lower jaws from the Albertosaurus and Gorgosaurus, types of tyrannosaurs commonly found in Canada that predated the T. rex by millions of years. Our fossil records for those two species of tyrannosaurs is excellent, Therrien said about the collection at the museum. We have so many specimens of those . that represent a full growth series from very young individuals that were probably three or four years of age all the way to fully grown adults that were over 20 years of age.

Jared vorisKohei tanakaDarla zelenitskyUniversity of calgaryCanadian journal of earth sciencesRoyal tyrrell museum in drumhellerUniversity of tsukubaRoyal tyrrell museumCanadian journalEarth sciencesCanadian pressஜாரெட் வோரிஸ்பல்கலைக்கழகம் ஆஃப் கல்கரிகனடியன் இதழ் ஆஃப் பூமி அறிவியல்அரச டைரெல் அருங்காட்சியகம் இல் டிரம்ஹெல்லர்பல்கலைக்கழகம் ஆஃப் ட்சூகுபா