Size: Sue is the largest known specimen of a T. rex. Her huge size has set new records for length and estimated weight for her species.

Completeness: Sue's skeleton is over 90% complete. The more complete a skeleton is, the more information it contains and the more it can teach us about how T. rex lived.

Quality of preservation: Most of Sue's bones are so well-preserved that, 67 million years after her death, you can still see fine surface details. These details help researchers work out what Sue might have looked like and how she moved when she was alive.