Guessing that pterosaurs might launch into the air differently than modern birds, Habib compared CT scans of both animals’ leg bones and then ran simulations to illustrate how they would have moved. His analysis suggested that, rather than leaping from two legs like birds, pterosaurs launched from all fours like bats. Though his theory provoked controversy at first, the recent discovery of fossilized flight tracks could confirm it. Habib also used computer modeling to calculate that pterosaurs could reach much larger sizes than previously known—a prediction validated when a giant pterosaur was unearthed last year. Now he’s using a similar approach to study the locomotion of early birds, the fins of extinct swimming reptiles, and the flight dynamics of tiny, bug-eating pterosaurs.