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Some of the largest birds in history, called pelagornithids, arose a few million years after the mass extinction that killed off the dinosaurs and patrolled the oceans with giant wingspans for some 60 million years. A team of paleontologists has found two fossils — each from individual pelagornithids with wingspans of 20 feet or more — that show this gigantism arose at least 50 million years ago and lasted at least 10 million years.

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