The professor states that mother is the first thing that young gosling sees when it hatches. So it has to follow its mother for its own safety. Walking bird will follow anything that moves and has eyes. Experiments found that young geese will imprint on inanimate objects like plastic milk bottles that are a moving object. Moreover nesting birds imprinting can affect later learning and social behavior. If human brings up it, the bird’s social behavior will change to wrong species. Therefore, the bird can’t learn to associate with its own species and is rejected to others.