Reconstructing flight abilities of fossil birds from preserved wings and feathers is an important goal if we are to understand the evolution of flight.Wing-shape is known to correlate well with bird flight style[1],but functional wing-shape is almost impossible to reconstruct from fossils with a high degree of certainty.In contrast,however,individual primary feathers are often preserved Reconstructing flight abilities of fossil birds from preserved wings and feathers is an important goal if we are to understand the evolution of flight. Wing-shape is known to correlate well with bird flight style [1], but functional wing-shape is almost impossible to reconstruct from fossils with a high degree of certainty. contrast, however, individual primary feathers are often preserved