Proactive prevention is the best way to minimize wildlife damage. Try to protect high-value items with fences and physical deterents. Supply alternative resources so wildlife has less need for desired items. Provide feed stations, water and nesting material. Chemical repellents are an option. They work best when there are enough alternative resources in the area.
Competition and predation witnessed first-hand may make some people uncomfortable. Yet, competition and predation are natural in a diverse system of habitat, and cannot be eliminated.
The Internet Center for Wildlife Damage Management is a non-profit, grant funded site that provides research-based information on how to responsibly handle wildlife damage problems. The Center is a collaborative effort by Cornell University, Clemson University, University of Nebraska - Lincoln, and Utah State University.
Prevention and Control of Wildlife Damage is the nationally recognized handbook that details identification, control and management of over 90 species of wildlife, written by almost as many authorities in their respective wildlife areas.
Urban Pest Birds: Controlling Damage describes physical characteristics, habits and management of house sparrows, starlings and pigeons.
Or view the UNL Extension publications on Wildlife Damage Management topics.