Other birds may be more attracted to the colors of their own plumage as those could indicate a potential mate or another bird that is surviving well. 1  Most bright colors, however, can be used to attract birds, with certain bird species being more attracted to particular shades. 1  Red and Pink: Hummingbirds. 2  Orange: Orioles, hummingbirds. 3  Yellow: Goldfinches, warblers, hummingbirds.  Blue: Bluebirds, jays.
This phenomenon is called the founder effect. The founder effect is generically a loss of genetic diversity. But specifically, it refers to limited genetic diversity that occurs when a small group of individuals from a genetically diverse population of some species migrates away and forms a new colony.
More in Psychology. The halo effect is a type of cognitive bias in which our overall impression of a person influences how we feel and think about his or her character. Essentially, your overall impression of a person (He is nice!) impacts your evaluations of that person's specific traits (He is also smart!).