Damage to Structures
Gulls may peck at structures and roofs, remove insulation, and drop rocks and clams onto roofs or cars. Droppings of gulls often foul docks and boats, damage polyurethane materials, and contaminate areas where gulls congregate.
Damage to Livestock and Pets
Gulls predate on young and eggs of their own species and others, including ducks. They consume feed intended for livestock and may contaminate it with droppings.
Damage to Landscapes
Gulls may damage crops by feeding on cherries, blueberries, grapes, strawberries, tomatoes, and young vegetables.
Health and Safety Concerns
Gulls threaten the safety of humans at and near airports. They are the most common birds involved in aircraft strikes. Research has shown that gulls can carry salmonella, campylobacter, and listeria. Roosts of gulls near reservoirs have the potential to transmit diseases to humans. Gulls cause a nuisance when they nest on rooftops and seek food from people eating outside. Gulls may have detrimental effects on the breeding performance of other species of water birds.