Sinornis


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sparrow-sized fossil bird of the Jurassic period to the Cretaceous period having a keeled breastbone and vestigial tail

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In Early Cretaceous birds such as Sinornis and Iberomesornis, wing modifications indicative of advanced flight function are accompanied by a shortened tail skeleton and pygostyle (Sanz and Bonaparte 1992; Sereno and Rao 1992).