a behavior in which an individual substitutes one type of action for another when the first action is unsuccessful or when two competing motivations are present that lead to incompatible actions. A gull at a territory boundary may direct attacklike actions toward the ground rather than its rival due to simultaneous aggressive and fearful responses to the opponent. A laboratory animal that is frustrated by servings of food that are small and delivered slowly may express displacement behavior by drinking instead of eating. Also called displacement activity.