Flightless bird from the Cretaceous of Mongolia

  title={Flightless bird from the Cretaceous of Mongolia},
  author={Perle Altangerel and Mark A. Norell and Luis M Chiappe and James M Clark},
THE Late Cretaceous rocks of Mongolia have produced unusual and phylogenetically important dinosaurs1,2. Here we report a startling new example, Mononychus olecranus gen. et sp. nov., an avialian theropod dinosaur with a short, robust forelimb possessing a single stout claw. Several features, including a carinate sternum and reduced fibula, suggest that Mononychus olecranus is more closely related to modern birds than is Archaeopteryx lithographica. The two skeletons are among the best… Expand
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