BLACKSBURG, Va., April 15 -- Virginia Polytechnic Institute and State University issued the following news release:

"You want to stick your finger in a dinosaur brain?" asked Simba Srivastava.

Surrounded by cabinets full of ancient bones in the paleobiology lab, the Virginia Tech undergraduate student held out a lumpy, pockmarked fossil.

"This is a uniquely sucky specimen," said Srivastava. "It's so bad. Like, if you saw a human skull in this way, you'd throw up."

Nevertheless, the senior geosciences major spent two years unscrambling the ancient creature and determining its place in the story of evolution. His findings, which were published today in Papers in Palaeontology, shed light on how dinosaurs dominated the Jurassic period.

Th...