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17 April 2014 12:48 pm ,
Vol. 344 ,
Officials last week revealed that the U.S. contribution to ITER could cost $3.9 billion by 2034—roughly four times the...
An experimental hepatitis B drug that looked safe in animal trials tragically killed five of 15 patients in 1993. Now,...
Using the two high-quality genomes that exist for Neandertals and Denisovans, researchers find clues to gene activity...
A new report from the Intergovernmental Panel on Climate Change (IPCC) concludes that humanity has done little to slow...
Astronomers have discovered an Earth-sized planet in the habitable zone of a red dwarf—a star cooler than the sun—500...
Three years ago, Jennifer Francis of Rutgers University proposed that a warming Arctic was altering the behavior of the...
- 17 April 2014 12:48 pm , Vol. 344 , #6181
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Meet Microraptor, the Birdlike Dinosaur
6 December 2000 7:00 pm
Lumbering, long-necked sauropods like Diplodocus were some of the largest creatures that ever lived. Now Chinese paleontologists describe the smallest, at least of the dinosaurs: a Microraptor that would have easily rested in the palm of your hand. The lightweight, feathered creature reinforces the theory that birds evolved from dinosaurs.
Farmers in northeastern China unearthed Microraptor, and paleontologist Xu Xing of the Institute of Vertebrate Paleontology and Paleoanthropology (IVPP) in Beijing figured out what it was. As Xu studied the 125-million-year-old specimen, he noticed that the tail looked very familiar. In fact, it turned out to be an exact match for the tail on a fossil called Archaeoraptor, which National Geographic magazine had trumpeted as a "missing link" between birds and dinosaurs. Xu's discovery helped prove that Archaeoraptor is a composite assembled from pieces of two fossils: a primitive bird and a dinosaurian tail (Science, 14 April, p. 238).
After the chimera was exposed, Xu and his IVPP colleagues Zhonghe Zhou and Xiaolin Wang continued to study Microraptor. Based on its rodlike tail, the trio decided that Microraptor belongs to the dromaeosaurs, dinosaurs that many paleontologists consider to be the closest dinosaurian relatives of birds. The 39-centimeter-long Microraptor is also surrounded by carbonized impressions that resemble the contour feathers covering the bodies of modern birds. The feet, too, are very birdlike: The claws are curved and positioned in a way similar to Archaeopteryx, the oldest known bird, the researchers report in the 7 December issue of Nature.
Paleontologists aren't entirely sure what to make of those claws. Larry Witmer of Ohio University in Athens says the adaptation fits nicely with the idea that flight evolved not on the ground but in tree-dwelling animals--a minority view that he shares with Zhou and a handful of other paleontologists. But no one is sure about Microraptor's climbing habits. "Just because you have a curved claw doesn't mean you have to be up a tree," says Jim Clark of George Washington University in Washington, D.C.