Flap Over Flight Evolution
June 26, 2011
Birds flap their wings when they run up ramps. It takes less energy than flying. This is uncontroversial; it is observable, and science can measure the energy cost. But for at least eight years now, Ken Dial at the University of Montana has been claiming that this behavior explains the origin of flight in birds (01/16/2003, 12/22/2003). When he first came out with this hypothesis in 2003, Elisabeth Pennisi in the journal Science said, “I imagine people will continue to argue about the origin of bird flight for a long time.” There’s been very little argument in the media over the years, though (05/01/2006, 9/22/2007, 1/25/2008); in fact, the BBC News just gave another plug for Dial’s hypothesis with no criticism at all.