When aircraft fly the air pressure on the underside of the wing is greater than on the topside. This pressure difference provides the needed lift force on the wings. It also causes the air at the end of the wing to move upward and then around in a circle, resulting in a strong vortex that trails the wing tips as the aircraft flies (see photo). Birds also have trailing vortices but they are far more complex given the complicated shape of the wing and the bird’s flapping motion. And so while it is tempting to think that the familiar V-formation used by migrating birds is for aerodynamic efficiency, evolutionists have long since been skeptical because of the tremendous precision that would be required for birds to take advantage of the complicated aerodynamic environment. Perhaps, evolutionists thought, the formations were used simply to follow leader, or for protection from predators. But afantastic new study—using miniature sensor packages consisting of a satellite GPS receiver and accelerometers—has demonstrated that birds do indeed track their aerodynamic environment in real-time and take advantage of it with precise positioning and wing flapping: Read more