Birds are a pleasant sight to see. Not until they overpopulate and nest on your roof! If the bird problem is a recurring dilemma to you, then consider using these Pigeon Spikes! The Pigeon Spikes offers a safe, humane, and effective way of keeping birds off of your roof, fence, or lawn. These spikes do not intend to kill the birds, they just act as barriers so birds can no longer enter your roof or ledge.