A newly declared species may be the largest flying bird to ever live

... sandersi, which may be the biggest flying bird ever found. Paleontologist Dan Ksepka of the Bruce Museum in Greenwich, Conn., theorizes that the giant bird, discovered as a fossilized skeleton in 1983, may have been able to fly by running downhill ...

http://westhawaiitoday.com/community-bulletin/newly-declared-species-may-be-largest-flying-bird-ever-live