The largest, best-preserved, and complete T rex is named Sue, after Sue Hendrickson, the woman who unearthed it from western South Dakota on August 20, 1990. 67 million years back, Sue (the lizard, not the fossil hunter) crushed small creatures with the weight of seven tons. Her skull alone weighs 750 pounds (at 5.2 ft. long). Sue had serrated teeth up to a foot long and was 42 feet snout-to-tail. Most of her 250+ bones have been found. If you live in hardcore Chicago, you may ogle Sue beginning May 17th, at the Field Museum of Natural History.