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Nature 421, 323-324 (23 January 2003) | doi:10.1038/421323a
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Palaeontology: Dinosaurs take to the air
Richard O. Prum
Abstract
Flying birds evolved from a group of bipedal dinosaurs. The latest fossil discoveries from China indicate that the dinosaurian ancestors of birds had four wings — and that these animals glided rather than flapped.
Three questions lie at the heart of the debate about the evolution of birds: the origin of the group itself, the origin of feathers and the origin of flight. Progress in reconstructing the evolutionary history of dinosaurs has established a well-corroborated answer to the first question1.
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