Argentavis magnificens (Wikipedia)
Largest Flying Bird Could Barely Get off Ground, Fossils Show (National Geographic)
The aerodynamics of Argentavis, the world's largest flying bird from the Miocene of Argentina (Proceedings of the National Academy of Sciences of the United States of America, Sankar Chatterjee,R. Jack Templin and Kenneth E. Campbell, Jr.; edited by Steven Vogel)
