I knew those miserable ants were good for something!
LOL
http://www.tanglefoot.com/products/birdrepel.htm
Tanglefoot Bird Repellent adheres to all surfaces while retaining its soft, sticky elasticity. It simply deters nuisance birds from their resting places by making roosting areas undesirable. Registered with the U.S. Environmental Protection Agency, Tanglefoot Bird Repellent is clear and odorless, and can be easily replaced or re-coated as the sticky material collects feathers, dust and other debris.