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Horner/Dinosaur Lives/T. rex eyes

OK... just finished reading J. Horner's book "Dinosaur Lives." In it,
elaborates a bit upon his reasoning on the matter of insisting that
tyrannosaurs were pure scavengers. One item I found questionable is his
statement that tyrannosaurs had tiny eyes, and tiny eyes usually denote
poor vision.

 Granted, when compared to the size of the animal, the eyes may seem
small... but just how large WAS a tyrannosaur eyeball taken in & of
itself? And would that have any bearing on the likelihood of it being
complex enough to house the structures needed to give a tyrannosaur keen