Pigeons
Pigeons can be a huge excrement mess problem.
The Pigeons additionally can cause indirect damage to tar and gravel roofs. They consume gravel as a grinding agent for their food. The pea sized gravel that covers these roofs and protects the tar from the suns ultraviolet rays, is soon depleted and the roof is compromised.
Pigeons are also well known for inhabiting warehouses, hangers, gymnasiums, or any other building with a tall interior ceiling and some access point for them. Once in, they will nest in your insulation and just make an awful mess.
Most birds can be successfully harassed off of, or out of these buildings under low light conditions using the lasers we have developed. It is important that this be accomplished during non-occupant load periods when being done inside a building.