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" ... Not all pelagornithids were gigantic, some had wingspans more on the order of 5-7 feet, but there seems to have been two main varieties in Antarctica during the Eocene and both were extremely large. In fact, birds in this group kept their giant sizes until they went extinct 2.5 million years ago. They were able to fly because their bones were pneumatized—meaning air sacs from the lungs pushed into their thin walled bones creating empty cavities, making them extremely light. ... "