And it rivals that of the largest flying bird on record: Argentavis magnificens-a South American condor with a 23-foot (7-meter) wingspan that glided among the mountaintops of the Andes six million years ago. "Pelagornis was certainly much lighter and a better 'flier'" than the vanished giant condor, says paleontologist Antoine Louchart of France's Institute of Functional Genomics in Lyon, who was not involved with the study. The most interesting finding in the new study, says Louchart, is that the ancient seabird may have soared just above the ocean waves for long distances, rather than ascending air currents to maintain high altitudes, as some large birds do today.Ī model of Pelagornis sandersi's flight suggests that larger wings actually meant less drag from wingtip turbulence once the flier was aloft. (Related: " Giant Prehistoric Bird Crushed Seeds, Not Little Horses.") The challenge for this seabird would have come during takeoff.Īt 48 pounds (21.8 kilograms), Pelagornis sandersi was not as heavy as a flightless ostrich-which can weigh 320 pounds (145 kilograms)-but it was still likely too heavy (and had feet too tiny) to run on the water and take off like a goose or other waterfowl. "I think they just waited on the beach for a strong wind to carry them aloft," Ksepka says. More than 33 feet (10 meters) of ocean water covered the part of coastal South Carolina where the Pelagornis sandersi bones came to rest 25 million years ago. The bird's name honors Charleston Museum curator Albert Sanders, who uncovered the skull, wing, and leg bones of the ancient seabird ahead of runway construction three decades ago. Ksepka says Sanders, an expert on ancient whales, "showed the bones to me in a drawer," where they awaited analysis for decades. The so-called teeth of the bird were actually bony projections from its beak-good for spearing prey, which may have included other birds or other birds' prey. Such "toothed" birds thrived from 55 million to 3 million years ago, before becoming extinct for reasons unknown.
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