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.
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Prum, R. Dinosaurs take to the air. Nature 421, 323–324 (2003). https://doi.org/10.1038/421323a
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DOI: https://doi.org/10.1038/421323a
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