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After the end-Cretaceous extinction event, the non-avian dinosaurs, the ancestors of birds, were all extinct. A large number of bird-shaped dinosaurs and modern birds died out in the tens of millions of years after the event, leaving only fossil traces, such as Gaston orniformes. However, birds quickly re-occupied various pelagic niches on Earth in the tens of thousands of years after the extinction of the dinosaurs and have maintained them to this day