They weren't racehorses, Sereno said, but they could move quickly.

他们不是赛马，Sereno说，不过他们能快速移动。

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The fossil find shows some modern animal behavior has very old roots, Sereno said.

Sereno说这次化石的发现显示了一些现代的动物行为能追溯到远古时期。

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"This is an early dinosaur blueprint," says Sereno, " with features they'll have for millions of years.

塞利诺说：“这是早期恐龙的蓝本，具有它们将保持几百万年的特征。

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Professor Sereno received fossilized remains of the creature three years ago from a private collector in the American state of Massachusetts.

VOA: special.2009.10.13

He helped write about Raptorex Kriegsteini with Paul Sereno of the University of Chicago, the lead writer and researcher.

VOA: special.2009.10.13

Paul Sereno said the fossil will be returned to China and put in a museum when the scientists have finished their studies.

VOA: special.2009.10.13

Prof Paul Sereno, from the University of Chicago, has published the analysis in the journal Zookeys.

BBC: Dwarf 'vampire' dinosaur was a plant eater

Sereno came across the specimen as a graduate student while doing research in a Harvard University laboratory and intended to write about it immediately.

BBC: Dwarf 'vampire' dinosaur was a plant eater

"The amazing thing about the geologic record and the fossil record is that sooner or later some piece of research, some amazing find, sheds light on things that you think are absolutely unanswerable, and really changes the whole picture, " said Professor Sereno.

BBC: NEWS | Science/Nature | Golden age of dino finds forecast