> The pterosaur's wingspan and size have spawned comparisons to dragons. But recently some scientists wondered whether the creature was too big to fly. A pair of papers recently asserted that the biggest pterosaurs may have been too heavy to get off the ground. That seemed implausible to Habib. After all, the biggest birds often have the longest flight range. And Quetzalcoatlus, with its 35-foot wingspan, certainly fits the bill for gigantic. So Habib teamed up with Mark Witton, a British paleontologist, to plug in factors like wingspan, weight and aerodynamics into a computer model. The results, which they presented...