Bird Spikes: How to Keep birds away with Bird Spikes
Bird spikes are a great way to keep pest birds off ledging or other architechural structures where there is a limited surface area for birds to land on. Bird spikes are literally just spike strips that glues to cement or other objects. You might see bird spikes in subways or on the sides of buildings - the spikes are placed there to deter birds from landing there and dropping feces or causing noise issues.
If you've been to any larger city, you'll understand how pesky pigeons and other birds can be. They are smart, and hard to deter since they are so accustomed to human interaction. The only real way to keep them out of areas is to put phsyical barriers like bird spikes or bird netting to make it impossible for them to roost.
More bird spikes info here: http://birdspikes.org
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