Sinornis

Sinornis is a genus of enantiornithine birds. Several referred fossils were recovered from the Jiufotang Formation at Liaoning, People`s Republic of China. The Jiufotang overlays the Yixian, which suggests an Aptian or Albian age (between 100-120 million years old), according to Swisher et al. (1999). Sinornis is known only from the type species,....
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Sinornis

noun sparrow-sized fossil bird of the Jurassic period to the Cretaceous period having a keeled breastbone and vestigial tail; found in China; considered possibly the second most primitive of all birds
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Sinornis

[n] - sparrow-sized fossil bird of the Upper Jurassic to Lower Cretaceous having a keeled breastbone and vestigial tail
Found on http://www.webdictionary.co.uk/definition.php?query=Sinornis
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