Mary recently got a pet duck. One day the duck stretched its wings and Mary threw a piece of bread to it. Later the duck again spread its wings and Mary threw it some bread. The duck began to spread i?

its wings every time Mary approached with bread, seemingly associating the action with receiving food. This behavior indicates that the duck has learned to expect a reward whenever it spreads its wings in Mary's presence. Such conditioning can strengthen the bond between them, as the duck recognizes Mary as a source of food and comfort. Over time, this could lead to more interactive and playful behaviors between Mary and her pet.