New Study Suggests Missing Link that Explains How Dinosaurs Learned to Fly This is an absolutely fascinating article. Someone has studied how chukars run. Chukars can fly, but do seem to prefer to run uphill. Until now, no one really thought anything of it, but the scientist who studied them has found that the flapping of their wings actually gives them better traction and they can run up slopes of 105 degrees. Instead of flapping to create lift, the flapping motion pushes them forward and downward. This benefit (of escaping predators quickly) may have driven the evolution of wings and actual flight came later. Be sure to check out the two videos on this page - one of a three day old hatchling running up a small slope and one of an adult literally running up a vertical tree trunk!