These are known as compensatory response s. Increased immigration may follow removals, and some animals learn to avoid control efforts. The most effective way to control problem birds is to understand their daily requirements, and remove or exclude these. This kind of manipulation for purposes of increasing or decreasing numbers is an important part of wildlife management. Some basic principles provide a background for understanding how to control problem birds effectively and appropriately. Wildlife managers manipulate these elements to attract and maintain wildlife species and control problem species.
Space is the area needed by a wild animal.
Just as some people are happy in a city apartment while others need a sprawling ranch, some birds need more space than others. In most cases, the male bird establishes and defends the territory. In the spring the brightly colored male sings to attract a mate and to announce to other male birds of the same species the location of his territorial space. After the pair builds a nest, the male continues to defend the territory while the female hatches eggs. This factor cannot be controlled because space is determined by the area of a yard or farmstead.