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Birds have long captivated us with their grace and power— from the bald eagle gracing the U.S. Great Seal to the American robin crowned as Wisconsin’s state bird. Yet even these icons pale beside the greatest flyer the planet has ever seen.
Among living species, the heaviest capable of powered flight is the kori bustard of southern Africa, tipping the scales at 42 lb and stretching a wingspan of 9 ft. The wandering albatross, however, commands the longest wingspan in the sky, averaging 8.2‑11.5 ft. Both impressive, but still dwarfed by a single extinct species.
The Pelagornis sandersi, discovered during a 1983 expansion of Charleston International Airport and later unearthed in a museum drawer by fossil expert Dan Ksepka, measured an astonishing wingspan of about 21 ft according to a 2014 paper in the Proceedings of the National Academy of Sciences. Physiological models suggest a range of 19.5‑24 ft and a mass between 48.5 and 88 lb—well beyond any extant bird.
Pelagornithidae, the family to which P. sandersi belonged, were pseudotoothed (bony‑toothed) seabirds that survived the mass extinction 65 million years ago and persisted until roughly 2.5 million years ago, just before the Quaternary ice ages. Fossils from 55‑35 million years ago reveal that they roamed even Antarctica when the continent enjoyed a temperate climate.
These giants were adept at long‑range gliding and dynamic soaring, riding wind gradients over oceans at speeds up to 40 mph. Their enormous wings were ill‑suited for rapid flapping, so scientists infer that they relied on wind gusts or downhill launches to gain altitude, aided by the hollow bone structure common to modern fliers.
Unlike true teeth, pelagornithids sported sharp bony projections along their jaws—enabling them to snatch fish and squid while airborne. Evidence points to a diet of soft‑bodied marine life in the coastal waters of what is now North and South Carolina.
Fossils found on Seymour Island, Antarctica, and across the globe confirm that these birds were truly global nomads, mastering the skies over the ancient world.
