Abstract
Current controversy over the origin and early evolution of birds centres on whether or not they are derived from coelurosaurian theropod dinosaurs. Here we describe two theropods from the Upper Jurassic/Lower Cretaceous Chaomidianzi Formation of Liaoning province, China. Although both theropods have feathers, it is likely that neither was able to fly. Phylogenetic analysis indicates that they are both more primitive than the earliest known avialan (bird), Archaeopteryx. These new fossils represent stages in the evolution of birds from feathered, ground-living, bipedal dinosaurs.
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Acknowledgements
We thank A. Brush, B. Creisler, M. Ellison, W.-D. Heinrich, N. Jacobsen, E. and R. Koppelhus, P. Makovicky, A. Milner, G. Olshevsky, J. Ostrom and H.-P. Schultze for advice, access to collections and logistic support; and the National Geographic Society, National Science Foundation (USA), the American Museum of Natural History, National Natural Science Foundation of China and the Ministry of Geology for support. Photographs were taken by O. L. Mazzatenta and K. Aulenback; the latter was also responsible for preliminary preparation of the Caudipteryx specimens. Line drawings are by P.J.C.
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Qiang, J., Currie, P., Norell, M. et al. Two feathered dinosaurs from northeastern China. Nature 393, 753–761 (1998). https://doi.org/10.1038/31635
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DOI: https://doi.org/10.1038/31635