How do scientists know if dinosaur fossils are male or female?
If you go to The Field Museum in Chicago, you can see Sue, the largest, most complete Tyrannosaurus rex skeleton in the world. Sue is an impressive specimen, standing more than 13 feet (3.9 meters) tall and 42 feet (12.8 meters) long. Many dinosaur fossils have missing or broken bones, but Sue is more than 90 percent complete. Sue is also a real skeleton, not a cast. With the exception of the skull, on display elsewhere in the museum, the bones you can see are the real 67-million-year-old deal. Paleontologist Sue Hendrickson discovered the dinosaur’s bones in South Dakota on Aug. 12, 1990. Since then, researchers have figured out a lot about Sue’s life. In spite of breaking some ribs, Sue lived to a relatively old age for a
