摘要: The evolution of birds from a group small dinosaurs between 170 million and 150 years ago has emerged as textbook example major evolutionary transformation in the fossil record ( 1 ). attainment powered flight—that is, active flapping that generates thrust—has been widely regarded, sometimes explicitly but often implicitly, long march which natural selection progressively refined one subgroup into ever-better aerialists. However, recent discoveries reveal much more interesting story is beginning to be corroborated by biomechanical studies. According this story, development flight was chaotic, with different experimenting airborne behaviors using airfoil feather arrangements (see figure), until ultimately only modern survived.
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