July 8, 2014 in Nation/World

Fossil’s 21-foot wingspan made it largest flying bird

Amina Khan Los Angeles Times
 
Associated Press photo

This undated image provided by the Bruce Museum shows a rendition of Pelagornis sandersi.
(Full-size photo)

Sometimes finding a skeleton in a closet can be a good thing – if you’re a paleontologist. Meet Pelagornis sandersi, a giant bird with a wingspan 21 feet across – so wide that it could have been the size of a (very) small plane.

The enormous extinct avian, described in the Proceedings of the National Academy of Sciences, pushes the limit of what’s possible in bird flight.

The one and only known Pelagornis sandersi fossil’s wings stretch a whopping 20.99 feet – about twice that of the royal albatross, among the largest living birds capable of taking to the skies.

The remarkable bones were actually discovered in 1983 near Charleston Airport in South Carolina, but they remained hidden in a drawer at the Charleston Museum until study author Daniel Ksepka, a paleontologist then at North Carolina State University in Raleigh, came across them about three decades later.

Ksepka, now at the Bruce Museum in Connecticut, named the specimen after Albert Sanders, the now-retired curator who collected the unique fossil after it was discovered – and who later invited Ksepka to come look through fossils at the museum.

P. sandersi, which probably lived 25 million to 28 million years ago, was probably larger even than another extinct mega-bird, Argentavis magnificens, Ksepka said. Some have previously estimated that Argentavis’ wingspan was nearly 22.9 feet, but Ksepka said with the data in hand, Pelagornis still wins: Argentavis would have had a size range of 16.69 to 19.91 feet and Pelagornis would have been longer, at 19.88 to 24.21 feet.

Birds come in all sizes – and some species that have cropped up over the last 150 million years have been a thousand times larger than their brethren. But there’s a cost. As a bird gets heavier, it becomes harder and harder for its muscles to propel the bird up and away. This means there must be a natural limit – and if scientists weren’t able to study the fossil record, they might be tricked into thinking that the wide-winged albatross sat near that upper limit.

But the skeletons of long-gone fliers like Pelagornis shows that it must be possible. Ksepka thinks it’s partly due to the bird’s shape, because it had extra long wings compared to its relatively small body. This old bird could probably have glided at a decent clip, around 39 miles per hour.


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