Rethink on bird evolution

Discovery of fossil remains of a small birdlike dinosaur, Buitreraptor gonzalezorum, with wing-like forelimbs, from the Nequén Basin in central Argentina has the scientific community in a huddle. This latest find could imply that flight evolved twice, once in birds and once among this group of Gondwanan dromaeosaurs. The lineage can be traced back to the Jurassic (206 to 144 million years ago). Details of the discovery appear in the journal Nature