Navigational Theory 6: Instinct

This theory suggests that the pigeons use instinct, not the thinking process, to guide them home. This is probably the least accepted theory, however, as it is easily reasoned away: As I have observed, the pigeons clearly make decisions as they are navigating. Even when they are initially circling to gauge their global positioning, they are making decisions. They may start out in a direction that is not accurate: However, in these rare situations, they often return to the point of release and re-assess their interpretations by circling again. And then once again they will start out in a direction they believe to be more accurate, and eventually gain accurate bearings.

Also, when the skies are overcast, though the pigeons might head off in the wrong direction, and other things in their environment may delay them, the pigeon is able to consistently adjust and re-assess its direction (clearly making a series of choices) and is able to locate proper direction and a safe return home.