The three fossil specimens (from left to right), Avisaurus darwini, Avisaurus sp., and Magnusavis ekalakaensis, all of which are represented by a tarsometatarsus. They are all shown to scale with one ...

WASHINGTON, Oct 9 (Reuters) - In western North America during the twilight of the dinosaur age, the unquestioned ruler was Tyrannosaurus rex, one of the largest terrestrial predators in Earth's ...

Newly discovered birds from Late Cretaceous North America were hawk-sized and had powerful raptor-like feet, according to a new study. Newly discovered birds from Late Cretaceous North America were ...

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Reconstruction of an avisaurid (e.g., A. darwini). Morphology of the tarsometatarsus suggests that these large birds engaged in raptorial behavior and could carry proportionally large prey.