Scientists in China have found the fossils of a feathered creature, identified as a small dinosaur, that they say casts new light on the origin of birds and their ability to fly.
With two sets of wings, one on the forelimbs and the other on its legs, it was a strange-looking animal, something like a scaled-up, three-foot-long dragonfly, but with feathers. All four wings were covered with feathers arranged in a pattern similar to that on modern birds. Even its long tail was fringed with feathers.
Reporting the discovery in today's issue of the journal Nature, the Chinese paleontologists said the animal probably used its four wings to glide from tree to tree, much as flying squirrels do today. This represented, they said, a previously unknown intermediate stage in the evolution of birds and flight.
"The significance of the new fossils is far beyond the strange appearance," the leader of the discovery team, Dr. Xing Xu of the Institute of Vertebrate Paleontology and Paleoanthropology in Beijing, said in a statement. "It brings important information to the long-debated issue of avian flight origin."