A large number of various overhead power lines is termed „wiring the landscape”. Power lines pose many problems, not only aesthetic ones. Installing power transmission lines and their maintaining can lead to destroying and degrading bird habitats. Some bird species avoid staying and nesting in the vicinity of transmission lines. Furthermore, many birds are killed by colliding with lines or electric shocks. The article discusses mortality in birds caused by power lines: ways of preventing birds from colliding with lines are especially dealt with.