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The small (1 meter) Cretaceous theropod dinosaur Sinosauropteryx from Liaoning Province, China. Extraordinary preservation includes remnants of the abdominal region as well as an eye and curious filamentous structures along the back and tail. The shape of the abdominal cavity is consistent with diaphragm-assisted lung ventilation in theropod dinosaurs. See page 1267 and the related News story on page 1229. [Photo: Courtesy of Donald L. Wolberg, project director, The Academy of Natural Sciences; photographer, David Bubier]

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Science. ISSN 0036-8075 (print), 1095-9203 (online)