National Geographic : 2003 May
Other scientists aren't sure what to make of the new fos sil, arguing that gliding doesn't necessarily evolve into pow ered flight: Why waste energy beating your wings when you could take it easy? And how, they wonder, could M. gui have assumed the spread-eagle posture gliding requires? Dinosaurs nor mally carried their legs under their bodies; they couldn't move them out to the sides. Some researchers suggest that M. guif's leg feathers weren't useful for flight at all. They might instead have played a role in sexual dis play, or perhaps to make a tiny dinosaur look bigger. -C hritoper P Sloan .