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Sparrow-sized fossil bird of the Upper Jurassic to Lower Cretaceous having a keeled breastbone and vestigial tail
Answer for the clue "Sparrow-sized fossil bird of the Upper Jurassic to Lower Cretaceous having a keeled breastbone and vestigial tail ", 8 letters:
sinornis
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Word definitions in Wikipedia
Sinornis is a genus of enantiornithine birds. The fossils recovered from the Lower Cretaceous lake deposits from the Jiufotang Formation at Liaoning , People's Republic of China . This 135 million-year-old sparrow-sized skeleton represent a new avian which ...