I'd leave him there. He may help with fuel mileage.
"One of the most unique aerodynamic characteristics of birds is that nearly all of their lift and thrust is exclusively generated by their wings......... This provides, among other things, near instantaneous control of both flight direction and speed.
To aid in the generation of thrust and lift during flight, birds will change their wing shape through a process called active morphing........... As a result, this minimizes drag while maximizing thrust and, consequently, energy efficiency. "
Although, I'm pretty sure this guy is hurting our gas mileage....