What is the best method to keep birds from roosting on window ledges?

Installing porcupine wire is an effective method to prevent birds from roosting on window ledges because this type of wire creates a physical barrier that makes it uncomfortable for birds to land or perch. The spikes or wires are not harmful, but they deter birds by making the surface less accessible and inviting. This method is widely used in urban environments to protect both buildings and structures from potential damage caused by bird droppings and nesting.

While other methods may have some deterrent effects, they do not provide the same level of effectiveness. For example, using bird feeders nearby can attract birds rather than deter them, and painting the ledge a bright color may not significantly impact their behavior. Removing nearby trees could potentially disrupt their habitat but might not be feasible or environmentally friendly, and it still wouldn't guarantee a solution for roosting on ledges. Overall, installing porcupine wire directly addresses the issue by making it difficult for birds to roost without causing harm to them.