67 million years ago in what will someday become South Dakota, the Tyrannosaurus rex known as Sue (or alternately FMNH PR 2081) stalks a stray hadrosaur. As you can see from the infections on its lower jaw, the T. rex has come down with a potentially lethal case of the disease Trichomonas gallinae, which will leave its mark on the bone for paleontologists to discover.
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