Fossil of biggest-known flying seabird: Pelagornis sandersi

Fossilised bird bones uncovered in the US represent the largest flying bird in history, Pelagornis sandersi, with a wingspan of 6.4 metres, twice as long as the biggest modern-day seabird, the royal albatross.  Coupled with its long beak and sharp bony teeth, the enormous wings likely helped the bird master long periods of gliding over water in search of seafood some 25 to 28 million years ago.