In this undated photo made available by journal Nature on Jan. 15, 2015, a northern bald ibis (Geronticus eremita) flies in Tuscany, Italy. A new study released Wednesday, Jan. 15, 2014 says the birds choreograph the flapping of their wings, getting a boost from an updraft of air in the wake of the flapping wings by flying behind the first bird and off to the side. When a flock of birds take advantage of these aerodynamics, they form a V. (AP Photo/Markus Unsöld)