Skeleton of Microraptor gui

Figure 1. Skeleton of Microraptor gui, a feathered dinosaur from the early Cretaceous (about 125 million years old) of China has preserved traces of feathers in the wings and legs, suggesting a biplane configuration. The animal was about 30 inches long with a bony tail and weighed about 2 pounds (courtesy: Dr. Xing Xu)

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Geological Society of America
2005 Annual Meeting News Release 05-38, 14 October 2005.