What did the extinct bird Pelagornis sandersi eat? With a wingspan up to 24 feet and jaws lined with spiky, toothy projections, anything it wanted. The massive seabird, known from a 25-million-year-old fossil excavated in South Carolina, has the largest wingspan of any bird ever found. It edges out the extinct South American condor-like Argentavis magnificens (with an estimated wingspan of 20 feet), and it dwarfs the largest living airborne bird, the wandering albatross (11-foot wingspan).