They bank just like planes, but their tails appear to offer no vertical rudder surface. . A bird can twist its tail laterally, from left to right, and downward, so it acts almost as a braking system that allows it to bank into turns. Some birds are better at this than others, he continued. There are other turning mechanisms as well. The feet have a lot of surface area, which creates wind resistance, and can be used much the way other birds might use their tails to steer.
Birds also steer by changing their wing configuration.
A greater angle of attack creates more wind resistance, and applying this differentially on each wing allows the bird to turn. New questions are answered on the site every Tuesday and Thursday.