| 1 | Xu calls it a "four-winged" dinosaur because it had long, pennaceous feathers on its arms and legs. | |
| 2 | "Deep in evolutionary history, it is extremely difficult to draw the line between birds and dinosaurs," says Xu. | |
| 3 | Xu Xing, a paleontologist who has discovered more dinosaur species than anyone in history, says several of his finds came from such dealers. | |
| 4 | Now, renowned Chinese palaeontologist Professor Xu Xing believes his new discovery has finally knocked Archaeopteryx off its perch. | |
| 5 | More elaborate dinosaur feathers had already been found, but "these structures were novel," says Xu, of Beijing's Institute of Vertebrate Paleontology and Paleoanthropology. |
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