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A previous study, published on 2004 by Graeme D. Ruxton and David C. Houson would also find that to be a pure or obligate scavenger, vertebrates would have needed to be large bodied and capable of soaring flight. The pair would also find that the evolution of a terrestrial obligate scavenger was unlikely, even with the absence of birds, because vultures have had to specialize for low energy travel; sacrificing the agility needed to kill prey in order to become exclusive scavengers. Terrestrial carnivores on the other hand are under no selection pressure to become exclusive scavengers and would have had more advantage in being able to switch between being a predator and scavenger.

http://www.sciencedirect.com/science/article/pii/S0022519304000542

Various studies also suggest that Tyrannosaurus preferred different prey at different stages of its life. In K. T. Bates and P. L. Falkingham study, they found that there was a great disparity between the bite force of adult and juvenile Tyrannosaurus. Tyrannosaurus did not recieve their immense bite force until they were adults. This, according to the pair showed a difference in feeding ecologies. The poweful bite forces of adults may have allowed them to act as large prey specialist and thereby alleviate competition with younger Tyrannosaurs.

Horner, Myrvholds study would also suggest that Tyrannosaurus may have fulfilled several ecological nitches.

Eric Snively on 2012 would suggest a similar idea, suggesting that the agility of tyrannosaurs allowed juveniles to replace smaller less agile predators in hunting medium sized prey.

In a thesis submitted to the Russ College of Engineering and Technology of Ohio University on 2012, Eric Snively would compare tyrannosaurs to other large theropods such allosauroids and find that they were more agile than none tyrannosaur theropods of similar mass. To back up his study, Snively quantified the differences in body form between the animals using various methods, measurements and examinations of the anatomy of the animals. Snively would find more adaptations of tyrannosaurs to reduce its rotational inertia and increase its agility such as the way the animal carried its head high in an exaggeration of an s curve, a proportionally shorter snout and tail than most large theropods, short arms and a relatively short region for origins for leg muscles. Snively would also propose that this additional agility would have enabled juvenile tyrannosaurs to replace smaller less agile predators in hunting midsized prey.