It is based on interpreting the birds' instincts and natural habits. Many parrot owners experience the reoccurring problem of misinterpreting their bird's behavior. They credit their birds with having the same intelligence and behavioral characteristics as human beings. They give their birds credit for being able to hold grudges, thoughtful of human's emotions, and considerate of human feelings. This simply is not true.
Birds are self-centered, and behave to please themselves.
Parrots cannot anticipate the results of an action until they have experienced the consequence of this action. If the consequence is positive, the action may be repeated. If negative or neutral, the action will probably cease. Some of the behavior we see in parrots is instinct driven. These behaviors are generally associated with survival and reproduction.