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The birds we see today are the predecessor of a dinosaur that learned to fly and survived mass extinction 66 million years ago, but little is known about their transition.

Masato hattoriDarla zelenitskyFrancois therrienRoyal tyrrell museumCanadian press zelenitsky scientistsProceedings of the national academy sciencesCanadian press hattoriUniversity of calgaryNational academyCanadian press