Which of these is a useful tip for excluding birds from buildings?

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Sealing broken windows is a practical tip for excluding birds from buildings because it removes potential entry points. When windows are damaged or broken, they can create openings that birds may exploit to enter a building. By repairing and sealing these openings, you can significantly reduce the likelihood of birds gaining access. This measure is essential in preventing birds from nesting inside or making buildings their habitat, which can lead to various issues such as noise, droppings, and health risks associated with bird-borne diseases.

In contrast, keeping windows open would facilitate entry rather than exclude them. Encouraging nesting is counterproductive, as it would invite birds into the structure, and removing roofing materials could create additional areas for birds to access and potentially nest in. Each of these other options would not contribute to controlling or excluding bird populations effectively.